Deuteronomy 16:3; Deuteronomy 26:7

3 Thou shalt eat no leavened bread with it; seven days shalt thou eat unleavened bread therewith, even the bread of affliction; for thou camest forth out of the land of Egypt in haste: that thou mayest remember the day when thou camest forth out of the land of Egypt all the days of thy life.

7 And when we cried unto the LORD God of our fathers, the LORD heard our voice, and looked on our affliction, and our labour, and our oppression: