John Gill Commentary Leviticus 14:29

"and the rest of the oil that is in the priest`s hand he shall put upon the head of him that is to be cleansed, to make atonement for him before Jehovah." — Leviticus 14:29 (ASV)

And the rest of the oil that [is] in the priest's hand
(See Gill on Leviticus 14:18).