And you shall remember that you were a slave in Egypt, and you shall be careful to observe these statutes.
Deuteronomy 16:12
Surrounding context
16:11 You shall rejoice before the LORD your God, you and your son and your daughter, your male servant and your female servant, the Levite who is within your gates, the stranger and the fatherless and the widow who are among you, at the place where the LORD your God chooses to make His name abide.
16:12 And you shall remember that you were a slave in Egypt, and you shall be careful to observe these statutes.
16:13 "You shall observe the Feast of Tabernacles seven days, when you have gathered from your threshing floor and from your winepress.