 It's from the sixth chapter of the Gospel of Mark. He went about among the villages teaching, and he called to him the twelve, and began to send them out two by two, and gave them authority over the unclean spirits. He charged them to take nothing for their journey except a staff, no bread, no bag, no money in their belts, but to wear sandals and not put on two tunics. Where you enter a house, stay there until you leave the place.