Charles Spurgeon Commentary Jeremiah 7:21-22

"Thus saith Jehovah of hosts, the God of Israel: Add your burnt-offerings unto your sacrifices, and eat ye flesh. For I spake not unto your fathers, nor commanded them in the day that I brought them out of the land of Egypt, concerning burnt-offerings or sacrifices:" — Jeremiah 7:21-22 (ASV)

You have heard what God said to them when they came out of Egypt.