Leviticus 8:24-25

²⁴Then he took Aaron's sons, and Moses put some of the blood on the point of their right ears and on the thumbs of their right hands and on the great toes of their right feet: and Moses put the blood on and round the altar.

²⁵And he took the fat, and the fat tail, and the fat on the inside parts, and the fat on the liver, and the two kidneys with their fat, and the right leg;