Luke 2:42 in the King James Version
And when he was twelve years old, they went up to Jerusalem after the custom of the feast.
Context
41 His parents went every year to Jerusalem at the feast of the Passover.
42 When he was twelve years old, they went up to Jerusalem according to the custom of the feast;
43 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,