John Gill Commentary Leviticus 14:25

"And he shall kill the lamb of the trespass-offering; and the priest shall take of the blood of the trespass-offering, and put it upon the tip of the right ear of him that is to be cleansed, and upon the thumb of his right hand, and upon the great toe of his right foot." — Leviticus 14:25 (ASV)

And he shall kill the lamb of the trespass offering
(See Gill on Leviticus 14:13). and the priest shall take [some] of the blood of the trespass
offering (See Gill on Leviticus 14:14).