Leviticus 4:25

And the priest shall take of the blood of the sin offering
with his finger
With the finger of his right hand, as the Talmudists ^F14 observe, and Gersom on the place; the priest first received the blood into a basin or ministering vessel, and then dipped the finger of his right hand into it, that next the thumb:

and put it upon the horns of the altar of burnt offering;
the four horns of it; in this there was a difference between the sacrifice of the anointed priest and of the congregation, and this of the ruler; the blood of the former was put upon the horns of the altar of incense, this upon the horns of the altar of burnt offering:

and shall pour out his blood at the bottom of the altar of burnt
offering;
the South bottom of it; the order of the priest's proceeding in putting the blood was different from that used in putting it on the horns of the altar of incense; here he first put the blood upon the southeast horn, then upon the northeast, next upon the northwest, and then upon the southwest; and upon the bottom of that horn where he finished, he poured the remainder of the blood, which was the southern bottom ^F15.