Christ Washes the Feet of his Disciples (1521)
This woodcut comes from Passionary of Christ and Antichrist, a famous series by the Renaissance artist Lucas Cranach the Elder (1472-1553). In the images below, Cranach contrasts Christ, who humbly washes his disciples’ feet, with the pope, who arrogantly allows his foot to be kissed. Woodcut, 1521.
Source: William Herman Theodore Dau, At the Tribunal of Caesar: Leaves from the Story of Luther's Life. St. Louis: Concordia Pub. House, 1921, pp. 258-59.