Luke 2:43
and having finished the days, in their returning the child Jesus remained behind in Jerusalem, and Joseph and his mother did not know,
Exodus 12:15
Seven days ye eat unleavened things; only -- in the first day ye cause leaven to cease out of your houses; for any one eating anything fermented from the first day till the seventh day, even that person hath been cut off from Israel.
2 Chronicles 25:17
And Amaziah king of Judah taketh counsel, and sendeth unto Joash son of Jehoahaz, son of Jehu, king of Israel, saying,
2 Chronicles 30:21-23
And the sons of Israel, those found in Jerusalem, make the feast of unleavened things seven days with great joy; and giving praise to Jehovah day by day are the Levites and the priests, with instruments of praise before Jehovah.