Exodus 12:15
King James Version
“Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.”
Context
12For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I the LORD.
13And the blood shall be to you for a token upon the houses where ye and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy when I smite the land of Egypt.
14And this day shall be unto you for a memorial; and ye shall keep it a feast to the LORD throughout your generations; ye shall keep it a feast by an ordinance for ever.
15Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
16And in the first day an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save which every man must eat, that only may be done of you.
17And ye shall observe unleavened bread; for in this selfsame day have I brought your armies out of the land of Egypt: therefore shall ye observe this day in your generations by an ordinance for ever.
18In the first on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.