Deuteronomy 16:12 in the King James Version
And thou shalt remember that thou wast a bondman in Egypt: and thou shalt observe and do these statutes.
Context
11 You shall rejoice before the LORD your God: you, your son, your daughter, your male servant, your female servant, the Levite who is within your gates, the foreigner, the fatherless, and the widow who are among you, in the place which the LORD your God shall choose to cause his name to dwell there.
12 You shall remember that you were a slave in Egypt. You shall observe and do these statutes.
13 You shall keep the feast of booths seven days, after you have gathered in from your threshing floor and from your wine press.