(One of a series of posts comparing ideas in the book of Exodus/Shemot with related ideas in the book of Psalms.)
After the tenth plague, the pharaoh finally lets the Israelites go. Then he has another change of heart, and sends a brigade of charioteers after them. At nightfall the Egyptians catch up with the Israelites at the shore of the sea—the Red Sea in English, the Sea of Reeds (yam suf—יַם סוּף) in the Hebrew Bible. Both parties camp for the night, with the Israelites trapped between the enemy and the water.
What happens next? The most familiar version of the story appears in this week’s Torah portion, Beshalach (“When he sent out”).

by William B. Hole (1846-1917)
The Prose Account
Moses stretched out his hand over the sea, and God made the sea move with a strong east wind all night. Vayasem the sea dry land, and the waters split. And the Israelites entered the middle of the sea on dry ground, and the waters were for them a wall on their right and on their left. (Exodus/Shemot 14:21-22)
vayasem (וַיָּשֶׂם) = and he/it placed, set, set up, put, put in.
Until I translated these verses, I had the impression that God simply splits the water down to the seabed, which becomes dry and firm enough for the Israelites to walk on. But the Torah says vayasem, as if there were no real bottom to the sea, so God has to install a strip of dry land. (Most English translations say God “made” or “turned” the sea into dry ground—which has the same implication.)
In the cosmology of the ancient Israelites, beneath the land lies a subterranean ocean of water called the tehom (תְּהוֹם —singular) or tehomot (תְּהֺמֺת —plural). This deep water bubbles up through the earth in the form of springs. Under the ocean, it’s water all the way down, with no ocean floor.1

And the Egyptians pursued, and all the horses of Pharoah, his chariots, and his horsemen entered after them into the middle of the sea. …And [God] made the wheels of their chariots swerve, and made them proceed laboriously. (Exodus 14:23, 25)
And Moses stretched out his hand over the sea, and the sea settled before morning into its normal flow. And the Egyptians were fleeing from it, and God na-ar the Egyptians into the middle of the sea. And the waters turned back, and they covered the chariots and the horsemen of all the army of Pharaoh, the one coming after them into the sea; not one remained. (Exodus 14:27-28)
na-ar (נָעַר) = shook out, shook off. (The form of this verb used in verse 14:27 is vayena-eir (וַיְנָעֵר). This verb appears only 12 times in the entire Hebrew Bible.)
Safe on the other side of the sea, the Israelites are awed by God’s miracle, and moved to sing along with Moses and Miriam.
The Song of the Sea
That was when Moses sang, along with the children of Israel, this song to God… (Exodus/Shemot 15:1)
The whole “Song of the Sea” that follows is a psalm written in archaic Hebrew, one of the two oldest texts in the Hebrew Bible.2 (The other is the Song of Deborah, Judge 5:1-31.) The scribe who redacted this week’s Torah portion inserted the well-known hymn without changing its archaic syntax and spellings.
The Song of the Sea does not mention God splitting the sea or the Israelites walking on dry land. Nevertheless, one early verse matches the prose account:

c. 1320 Spain
Chariots of Pharaoh and his army
[God] pitched into the sea,
And the best of his captains
sank in the Sea of Reeds. (Exodus 15:4)
Twice the Song of the Sea says the Egyptians sank all the way down into the tehomot.
Tehomot covered them;
They went down into the depths like a stone. (Exodus 15:5)
In the wind of Your nostrils the waters were dammed up.
They stood up like a dike [made of] waves,
Congealed tehomot in the heart of the sea. (Exodus 15:8)

2011 photo by NASA
You blew Your wind; the sea covered them.
They sank like lead in the mighty waters. (Exodus 15:10)
This description led 16th-century rabbi Obadiah Sforno to explain that the water at the bottom of the sea became solid, and the Israelites walked across the congealed or frozen water.
Psalm 136
The Bible includes several briefer descriptions of the crossing of the Sea of Reeds, all used as examples of God’s miracles on behalf of the Israelites. But the descriptions in Second Isaiah (51:9-10) and Psalms 77, 106, and 136 do not explain how the Israelites got across the water.
Psalm 136 does, however, refer to God as the one who split the sea, and like the prose account in Exodus it uses the rare word na-ar.
Who cut the Reed Sea into parts,
Because forever is [God’s] loyal kindness.
And let Israel pass through the middle,
Because forever is [God’s] loyal kindness.
Veni-eir Pharaoh and his army into the Sea of Reeds,
Because forever is [God’s] loyal kindness. (Psalm 136:13-15)
veni-eir (וְנִעֵר) = And [God] shook off, shook out. (Another form of the verb na-ar— נָעַר.)
We do not know which text first used the poetic image of God shaking off the Egyptians into the sea: Psalm 136, or one of the stories woven into the prose account in this week’s Torah portion. 3
If we follow the prose account, the sea divides and a miraculous strip of earth appears over the tehomot. I can picture the earth getting soggy after the Israelites have crossed, so the chariot wheels of the Egyptians get stuck in mud. Then the bridge of earth buckles and shakes off the Egyptians, chariots, and horses into the water, before God’s second wind blows the walls of water down over them.
On the other hand, if we take the Song of the Sea as the oldest, most authoritative account, and follow Sforno’s explanation that the water congeals into a frozen roadway between dikes of ice, then I can imagine the chariot wheels skidding out of control on the slippery surface. This provides an alternate explanation of the detail in the prose account that God “made the wheels of their chariots swerve, and made them proceed laboriously”. (Exodus 14:25) Then the ice-dikes break and the sea rushes over the Egyptians.
Either of these two pictures of the crossing of the Sea of Reeds is more vivid than most readers—and illustrators—of the Bible imagine.

Unless you are an eye witness, it takes vivid imagery to feel the impact of a miracle. The various Biblical accounts of crossing the Sea of Reeds are designed to make the descendants of the Israelites experience the feeling of a last-minute rescue, and to give them confidence that God has always been on their side. So for centuries the Israelites rejoiced over the miracle at the sea.
Yet after the second temple in Jerusalem fell in 70 C.E., some Jews questioned this attitude. In the Talmud, Rabbi Yochanan says God does not “rejoice in the downfall of the wicked”. He gives the crossing of the Sea of Reeds as an example, saying: “The ministering angels wanted to chant their hymns, but the Holy One, blessed be He, said: The work of my hands is being drowned in the sea, and shall you chant hymns?” (Babylonian Talmud, Soncino translation, Megilah 10b)
I, too, feel sympathy for the Egyptian soldiers. They have no more choice about following the Pharaoh’s orders than the Israelite slaves did before Pharaoh let them go. And their orders were to round up the Israelites (shooting arrows if necessary) and bring them back for re-enslavement.
Suddenly the Egyptians find themselves in the middle of a situation they never imagined was possible. They are chasing the Israelites across a dirt bridge over the sea, or maybe down an ice canyon. They see the ex-slaves reach the far side, but their chariot wheels are either mired in mud or skidding on ice. Then the Egyptians are shaken off the path like crumbs. And the sea crashes down on them.
Today people still experience events they never imagined were possible. Sometimes what seems like a good miracle to one group of people is worse than a nightmare to another group.
May we all learn the humanity to refrain from singing out with joy when our opponents are dying. And may God save us all when we find ourselves trapped in a situation we never imagined was possible.
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1 This detail supports Richard Elliott Friedman’s argument in his Commentary on the Torah (HarperCollins 2001) that although the body of water in question is called the Sea of Reeds, it is no shallow lake, but the Gulf of Suez–the western arm of the Red Sea.
2 The exodus from Egypt is set during Egypt’s 19th Dynasty, which ruled during the 13th century B.C.E. The Song of the Sea mentions the Plashet (Philistines), who did not emigrate to Canaan until about 1175 B.C.E. Thus Moses could not have known or composed the Song of the Sea, but the writer of the Song of Sea might have known the story of the exodus. According to modern scholars, the prose version of the story in Exodus is a compilation of three different stories written in Biblical Hebrew sometime after 700 B.C.E. The redactor also inserted the ancient Song of the Sea.
3 Psalm 136 cannot be reliably dated. The language is consistent with the Hebrew in the book of Exodus (excluding the archaic Song of the Sea). But it could have been written much earlier, and rewritten centuries later with updated language. Or it could even have been written during the time of the second temple, 530 B.C.E.-70 C.E.