Luke 2:44

His parents went every year to Jerusalem at the feast of the Passover.

When he was twelve years old, they went up to Jerusalem according to the custom of the feast;

and when they had fulfilled the days, as they were returning, the boy Jesus stayed behind in Jerusalem. Joseph and his mother didn’t know it,

When they didn’t find him, they returned to Jerusalem, looking for him.

After three days they found him in the temple, sitting in the middle of the teachers, both listening to them and asking them questions.

All who heard him were amazed at his understanding and his answers.