TSK · Numbers 28:17

For seven days you must eat bread made without yeast, and on the seventh day there is to be a festival to the LORD.

“You must keep the Feast of Unleavened Bread. For seven days you must eat bread made without yeast, as I commanded you; do this at the appointed time of the month Abib, for in the month Abib you came out of Egypt.

You must not eat any yeast with it; for seven days you must eat bread made without yeast, as symbolic of affliction, for you came out of Egypt hurriedly. You must do this so you will remember for the rest of your life the day you came out of the land of Egypt.