Leviticus 8:23

And he slew it; and Moses took of the blood of it, and put it upon the tip of Aaron’s right ear, and upon the thumb of his right hand, and upon the great toe of his right foot.

Cross-reference

Leviticus 14:14 applies the same blood-on-ear, thumb, and toe ritual to cleanse a leper, echoing the ordination pattern.

Leviticus 14:17 uses oil instead of blood on the same body parts for the leper's cleansing, a variation on the consecration ritual.

Leviticus 14:28 repeats the oil application to ear, thumb, and toe, completing the leper's purification.

Exodus 29:20 is the original command for this ordination ritual; Leviticus 8:23 records its execution.