Luke 2:41-43, 46-47

His parents went to Jerusalem every year at the Feast of the Passover. And when He was twelve years old, they went up to Jerusalem according to the custom of the feast. When they had finished the days, as they returned, the Boy Jesus lingered behind in Jerusalem. And Joseph and His mother did not know it

Now so it was that after three days they found Him in the temple, sitting in the midst of the teachers, both listening to them and asking them questions. And all who heard Him were astonished at His understanding and answers.