Isaiah 57:5 is God’s indictment of Israel for worshiping idols at sacred trees, springs and hilltops, including practices that involved child sacrifice. The verse describes idolatry as a kind of spiritual self-stimulation, a restless search for comfort and power in false gods. The words are spoken by the LORD through the prophet Isaiah to the people of Judah, whom he addresses sharply as the offspring of sorcerers and adulterers.
You who inflame yourselves among the oaks, under every green tree; who kill the children in the valleys, under the clefts of the rocks?
Isaiah 57:5 (WEB)
What Isaiah 57:5 Means
The phrase “inflame yourselves” describes a feverish, hungry devotion. The people are not merely mistaken about God; they are driven by desire, heating themselves up with religious excitement at places where they believed the gods could be reached. “Among the oaks, under every green tree” points to the shaded groves and sacred sites that Canaanite religion favored, places that looked fertile and alive but were pulled away from the true God.
The second half is the most shocking part. “Who kill the children in the valleys, under the clefts of the rocks” describes child sacrifice offered to foreign deities, a practice the Old Testament condemns repeatedly. The verse does not promise anything directly. It exposes what idolatry produces when it is followed to its end: a religion that devours the very people it claims to serve.
The Context of Isaiah 57:5
Isaiah 57 belongs to the larger section of the book, traditionally attributed to the prophet Isaiah, who ministered in Jerusalem in the eighth century BC. His audience is the covenant people of Judah, who had received God’s law and promises yet kept turning to other gods. Verses 2 through 8 contrast the peace of the faithful, who rest in their beds because they walk in uprightness, with the restlessness of those who chase idols.
Read in that setting, verse 5 is not a random list of pagan customs. It sits between God’s charge that the people are “children of disobedience” and his description of them setting their beds on high mountains and making covenants with other lovers. The surrounding verses show that the sin is first a broken relationship, a betrayal of the one who made them, and only then a set of wrong rituals.
Key Phrases in Isaiah 57:5
Exodus 20:3
“You shall have no other gods before me.
(WEB)
This commandment gives the foundation behind Isaiah’s rebuke. Israel was called to have no other gods before the LORD, and every act of idolatry in Isaiah 57 is a violation of that first command. Reading it alongside verse 5 shows that the prophet is calling the people back to the most basic part of their covenant.
Jeremiah 2:13
“For my people have committed two evils: they have forsaken me, the spring of living waters, and cut them out cisterns, broken cisterns, that can hold no water.
(WEB)
Jeremiah uses the picture of broken cisterns that cannot hold water to describe idolatry. This image pairs well with Isaiah’s description of people burning with desire for false gods, since both show how false worship promises life but cannot satisfy.
A Short Prayer From Isaiah 57:5
Lord, you see the places in my heart where I have burned with desire for things that cannot save me. Show me the idols I have set up, whether they are hidden in quiet corners or openly admired in plain view. Turn my heart back to you, and let my longing find its rest in your faithful love. Teach me to walk in uprightness, so that I may know the peace that comes from belonging to you. Amen.
