You are to keep the Feast of Unleavened Bread as I commanded you: At the appointed time in the month of Abib you are to eat unleavened bread for seven days, because that was the month you came out of Egypt. No one may appear before Me empty-handed.
Jewish Publication Society of America Version (JPS1917) - Exodus 23:15 >The feast of unleavened bread shalt thou keep; seven days thou shalt eat unleavened bread, as I commanded thee, at the time appointed in the month Abib — for in it thou camest out from Egypt; and none shall appear before Me empty;