Every week of the year has its own Torah portion (a reading from the first five books of the Bible) and its own haftarah (an accompanying reading from the books of the prophets). Last week the Torah portion was Vayikra (Leviticus 1.1-5:26) and the haftarah was Isaiah 43:21-44:23. This week the Torah portion is Tzav (Leviticus 6:1-8:36) and the haftarah is Jeremiah 7:21-8:3 and 9:22-23.
The first two Torah portions in the book of Leviticus/Vayikra consist entirely of instructions for making offerings on the altar: what each type of offering is for, what kind of animal or grain should be brought, and how the priests should process them. In Leviticus, this is the primary way to worship God, so the instruction manual is important.
The two accompanying haftarah readings both declare that offerings on God’s altar are meaningless when people are also making and worshiping idols.
The children of Judah have done what is bad in My eyes, declares God. They have set their abominable idols in the House with My name on it, defiling it. And they have built shrines of the Tofet in the valley of Ben-Hinnom, for burning their sons and their daughters in the fire, which I did not command and which did not arise in my mind. (Jeremiah 7:30-31)

Jeremiah decries the placement of statues of other gods right in God’s temple (“house”) in Jerusalem, as well as the practice of Tofet-worship in the valley below. The haftarah from Isaiah points out that a craftsman might burn part of a log to burn for heat and cooking, and carve another part of the log into a statue to which he bows down and prays.
Yotzeir of an idol—
All of them are emptiness;
And what they crave
Cannot be useful. (Isaiah 44:9)
yotzeir (יֹצֵר) = shaping, forming, fashioning.
Other gods and the statues that represent them are empty, useless. God is the yotzeir of real humans; but a human is a yotzeir of false gods.
Jeremiah agrees that worshiping other gods is useless. In a prophecy that follows this week’s haftarah, Jeremiah says:
And the towns of Judah and inhabitants of Jerusalem will go to the gods for whom they sent up offerings in smoke, and call for help. But they [these gods] will certainly not rescue them at the time of their adversity. (Jeremiah 11:12)
The haftarah in Isaiah goes a step further, and declares other gods simply do not exist.
Thus said God, king of Israel
And its redeemer, God of Armies:
I am first and I am last
And except for Me there are no gods. (Isaiah 44:6)
The haftarot in Jeremiah and Isaiah agree that God punished the people of Judah for making and worshipping other so-called gods by sending in the Babylonian army to conquer the land and destroy Jerusalem and its temple. (See my post Haftarah for Bo—Jeremiah: The Ruler of All Armies.)
Does that leave any hope for the future? Jeremiah, who witnessed the siege of Jerusalem in 589-587 B.C.E., predicts only more disaster.

And the carcasses of these people will be food for the birds of the sky and for beasts of the earth, and there will be no tomorrow. (Jeremiah 7:33)
And death will be preferable over life for all the remainder of those remaining from this wicked family, in all the places where I will push them… (Jeremiah 8:3)
But chapters 40-66 of the book of Isaiah were written at least 50 years later, after the Babylonian empire had been replaced by the Persians. Although the Jews did not get an independent kingdom again, the new Persian emperors granted them religious freedom and let those who wished go back to Jerusalem and build a second temple for their god.
The haftarah from Isaiah interprets this Persian policy as God’s intervention. After criticizing the Israelites for their idolatry, the haftarah says:
I have wiped away like a mist your rebellion
And like a cloud your transgressions.
Return to Me, for I have reclaimed You. (Isaiah 44:22)
How can they return? What should they do that is more important than making offerings at a rebuilt altar?
This week’s haftarah from Jeremiah says they should follow God’s directions for the right way to behave in the world.
Heed My voice, and I will be your god and you will be My people; but you must walk on the entire path that I command you, so that it will go well for you. (Jeremiah 7:23)
Last week’s haftarah from Isaiah says they should praise God to the rest of the world.
This people yatzarti for Myself:
My praise they should report! (Isaiah 43:21)
yatzarti (יָזַרְתִּי) = I formed, I shaped, I fashioned. (From the same verb as yotzeir above.)
Instead of forming statues of empty, useless gods, the people should report what the real God is.
But the Israelites of Judah turned deaf (according to Jeremiah) and mute (according to Isaiah) where God was concerned.
*
We still make idols for ourselves, 2,600 years later, and we still worship “gods” that are ultimately useless. Some people pursue power as if it were the source of life—until their careers or families crash and they discover they live in a spiritual exile. Others dedicate themselves to accumulating or spending money—until a disaster reveals how they devoted so much time and energy to something so transient. We do not need an anthropomorphic god to send an army against us; serving the false gods we create carries its own intrinsic punishment, preventing us from leading full and meaningful lives.
A Jeremiah can point out that the wrong path leads to a bitter death. Sometimes this is the slap in the face we need to wake up.
But an Isaiah can give us hope for a second chance, however late in life. If we return to God—if we return of a life of appreciating reality (one form of praising God), appreciating one another, remembering we are only human, and rejoicing when we come home to our better selves—then the divine spirit will wipe away our former false worship like a mist, like a cloud. We can change, and true meaning can return to our lives.