Jeremiah 7:22
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: 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:
When God brought Israel out of Egypt, He did not at that time speak to them and lay commands upon them concerning burnt offerings and sacrifices. His first and essential demand was that they obey His voice, walk in His ways, and belong to Him as His people. Outward religious acts were set in contrast to that faithful obedience, and could never replace it.