And when he was twelve years old, they went up to Jerusalem according to the custom of the feast.
All Commentaries on Luke 2:42 Go To Luke 2
Glossa Ordinaria
AD 1480
They were on their way home, one day's journey from Jerusalem; on the second day they seek for Him among their kinsfolk and acquaintance, and when they found Him not, they returned on the third day to Jerusalem, and there they found Him. As it follows, And it came to pass, after three days they found him.
Or because the advent of Christ, which was looked for by the Patriarchs before the Law, was not found, nor again, that which was sought for by prophets and just men under the Law, but that alone is found which is sought for by Gentiles under grace.
Or they feared lest Herod who sought Him in His infancy, now that He was advanced to boyhood might find an opportunity of putting Him to death.