Exodus 13:6

Seven days you shall eat unleavened bread, and on the seventh day shall be a feast to the LORD.

Exodus 12:15-20

Seven days shall you eat unleavened bread; even the first day you shall put away leaven out of your houses: for whosoever eats leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.

Exodus 34:18

The feast of unleavened bread shall you keep. Seven days you shall eat unleavened bread, as I commanded you, in the time of the month Abib: for in the month Abib you came out from Egypt.

Leviticus 23:8

But you shall offer an offering made by fire unto the LORD seven days: in the seventh day is a holy convocation: you shall do no regular work on it.

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