By the end of the Old Testament, the priests were allowing God’s people to bring their worst to Him. God brought a charge against them, reminding them of His love and the discipline that would ensue. He wanted their full attention, not their leftovers. He is not a pet at which to throw the scraps, but a Lion to be feared.
Watch the video here: https://www.thevillagechurch.net/resources/sermons/worthless-sacrifices/