Exodus 29:20

Then shalt thou kill the ram, and take of his blood, and put it upon the tip of the right ear of Aaron and upon the tip of the right ear of his sons, that is, upon the ear-lap, next to the opening, and upon the thumb of their right hand and upon the great toe of their right foot, the gestures conveying the duties of obedience, of willing work, and of a walk according to the precepts of God's holy Law, and sprinkle the blood upon the altar round about.