Jeremiah 2:3 Israel was holiness unto the Lord, and the firstfruits of his increase: all that devour him shall offend; evil shall come upon them, saith the Lord.
Warning to all these nations looking to devour Israel.
4 Hear ye the word of the Lord, O house of Jacob, and all the families of the house of Israel:
5 Thus saith the Lord, What iniquity have your fathers found in me, that they are gone far from me, and have walked after vanity, and are become vain?
Rebuke of Israel for walking after vanity and becoming vain. No difference between them and the world.