Matthew 2:12-13

And when they had taken an answer in sleep, that they should not turn again to Herod, they turned again by another way into their [own] country. And when they were gone, lo! the angel of the Lord appeared to Joseph in sleep, and said, Rise up, and take the child and his mother, and flee into Egypt, and be thou there, till that I say to thee; for it is to come, that Herod seek the child, to destroy him.