Luke 2:43

And when the feast was ended, as they were returning, the boy Jesus stayed behind in Jerusalem. His parents did not know it,

Exodus 12:15

Seven days you shall eat unleavened bread. On the first day you shall remove leaven out of your houses, for if anyone eats what is leavened, from the first day until the seventh day, that person shall be cut off from Israel.

2 Chronicles 25:17

Then Amaziah king of Judah took counsel and sent to Joash the son of Jehoahaz, son of Jehu, king of Israel, saying, "Come, let us look one another in the face."

2 Chronicles 30:21-23

And the people of Israel who were present at Jerusalem kept the Feast of Unleavened Bread seven days with great gladness, and the Levites and the priests praised the LORD day by day, singing with all their might to the LORD.

Treasury of Scripture Knowledge

Summary

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.

Bible References

General references

2 Chronicles 30:21
And the people of Israel who were present at Jerusalem kept the Feast of Unleavened Bread seven days with great gladness, and the Levites and the priests praised the LORD day by day, singing with all their might to the LORD.
2 Chronicles 25:17
Then Amaziah king of Judah took counsel and sent to Joash the son of Jehoahaz, son of Jehu, king of Israel, saying, "Come, let us look one another in the face."

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.