Luke 2:44

But they, supposing him to have been in the company, went a day’s journey; and they sought him among their kinsfolk and acquaintance.

Cross-reference

Luke 2:46 reveals Jesus was in the temple, resolving the family's search that began in verse 44.

Psalm 122:1-4 celebrates the pilgrimage to Jerusalem — the same custom of going up that Jesus' family observed here.