Rabanus Maurus
Catena Aurea · Matthäusevangelium 2
And when they were departed, behold, the angel of the Lord appeareth to Joseph in a dream, saying, Arise, and take the young Child and His mother, and flee into Egypt, and be thou there until I bring thee word; for Herod will seek the young Child to destroy Him. When he arose, he took the young Child and His mother by night, and departed into Egypt: And was there until the death of Herod: that it might be fulfilled which was spoken of the Lord by the prophet, saying, Out of Egypt have I called my Son.
Here Matthew omits the day of purification when the first-born must be presented in the Temple with a lamb, or a pair of turtle doves, or pigeons. Their fear of Herod did not make them bold totransgress the Law, that they should not present the Child in the temple. As soon then as the rumour concerning the Child begins to be spread abroad, the Angel is sent to bid Joseph carry Him into Egypt.