And the priest shall take one he lamb
One of the he lambs brought by the leper for his offering:
and offer him for a trespass offering;
for though the leprosy itself was a disorder or disease, and not sinful, yet the cause of it was sin, a trespass against God, and therefore a trespass offering must be offered: which was typical of Christ, whose soul was made a trespass offering, ( Isaiah 53:10 ) ; where the same word is used as here:
and the log of oil; (See Gill on Leviticus 14:10);
and wave them [for] a wave offering before the Lord;
heaving of them up and down, moving of them to and fro towards the several parts of the world, east, west, north, and south, even both the log of oil, and the he lamb for the trespass offering, and that alive, as Jarchi observes, and so says Maimonides F15.
F15 Hilchot Mechosre Capharah, c. 4. sect. 2.