Deuteronomy 16:12

And thou shalt remember that thou wast a bondman in Egypt ,.... And now delivered from that bondage; the consideration of which should make them liberal in their freewill offering, and generous in the feast they provided, and compassionate to the stranger, widow, and fatherless:

and thou shalt observe and do these statutes ; concerning the passover, the feast of unleavened bread, and of Pentecost, and the peace offerings and the freewill offerings belonging to them: and nothing could more strongly oblige them to observe them than their redemption from their bondage in Egypt; as nothing more engages to the performance of good works than the consideration of our spiritual and eternal redemption by Christ, 1 Corinthians 6:19 .