Luke 2:43

and as they were returning [to Nazareth], after spending the required number of days [at the Feast], the boy Jesus remained behind in Jerusalem. Now His parents did not know this,

Exodus 12:15

[In the celebration of the Passover in future years,] seven days you shall eat unleavened bread, but on the first day you shall remove the leaven from your houses [because it represents the spread of sin]; for whoever eats leavened bread on the first day through the seventh day, that person shall be cut off and excluded from [the atonement made for] Israel.

2 Chronicles 25:17

Then Amaziah king of Judah took counsel and sent word to Joash the son of Jehoahaz the son of Jehu, king of Israel, saying, “Come [to battle], let us face each other.”

2 Chronicles 30:21-23

The Israelites who were present in Jerusalem celebrated the Feast of Unleavened Bread for seven days with great joy. The Levites and priests praised the Lord day after day, singing to the Lord with loud instruments.

Treasury of Scripture Knowledge

Summary

Luke 2:43

And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.

General references

2 Chronicles 30:21

2 Chronicles 25:17

Bible References

General references

Then Amaziah king of Judah took counsel and sent word to Joash the son of Jehoahaz the son of Jehu, king of Israel, saying, “Come [to battle], let us face each other.”