Leviticus 8:22-23

²²He offered also the second ram, into the hallowing of (the) priests; and Aaron and his sons putted their hands upon the head thereof. (And then he offered the second ram, for the installation, or the ordination, of the priests; and Aaron and his sons put their hands on its head.)

²³And when Moses had offered that ram, he took of the blood, and touched therewith the last part of the right ear of Aaron, and the thumb of his right hand, and in like manner of his foot. (And when Moses had killed that ram, he took some of the blood, and touched with it the lobe of Aaron’s right ear, and the thumb of his right hand, and the great toe of his right foot.)