Wherefore.

Matthew 21:38
But when the tenants saw the son, they said to themselves, 'This is the heir; come, let us kill him, and take his inheritance!'

he is in the desert.

Matthew 3:1
In those days John the Baptist came, preaching in the wilderness of Judea

Isaiah 40:3
A voice of one calling: "Prepare the way for the LORD in the wilderness; make a straight highway for our God in the desert.

Luke 3:2, 3
during the high priesthood of Annas and Caiaphas, the word of God came to John son of Zechariah in the wilderness. . . .

Acts 21:38
"Aren't you the Egyptian who incited a rebellion some time ago and led four thousand members of the 'Assassins' into the wilderness?"