Exodus 2:16-19

16 The priest of Midian had seven daughters. They came to draw water, and filled the troughs to water their father's flock.
17 But some shepherds came and drove them away. Moses got up and came to their defense and watered their flock.
18 When they returned to their father Reuel, he said, "How is it that you have come back so soon today?"
19 They said, "An Egyptian helped us against the shepherds; he even drew water for us and watered the flock."