Targum zu Schemot 12:31

And the border of the land of Mizraim extended four hundred pharsee; but the land of Goshen, where Mosheh and the sons of Israel were, was in the midst of the land of Mizraim; and the royal palace of Pharoh was at the entrance of the land of Mizraim. But when he cried to Mosheh and to Aharon in the night of the Pascha, his voice was heard unto the land of Goshen; Pharoh crying with a voice of woe, and saying thus: Arise, Go forth from among my people, both you and the sons of Israel; and go, worship before the Lord, as you have said;