John Chrysostom — as excerpted in the Catena Aurea on Luke 22:7-13

“(Hom. 81. in Matt.) But as they knew not to whom they were sent, He gave them a sign, as Samuel to Saul, as it follows, And he said unto them, Behold, when ye are entered into the city, there shall a man meet you bearing a pitcher of water; follow him into the house where he entereth in. (1 Sam. 10:3.)”