Lucas 2

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,

Y acabados los días, volviendo ellos, se quedó el niño Jesús en Jerusalem, sin saberlo José y su madre.

And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.