Leviticus 6:25

Speak unto Aaron, and to his sons, saying, this [is] the law of the sin [offering],.... Or the rules to be observed concerning that, besides what had been already delivered in Leviticus 4:1:

in the place where the burnt offering is killed shall the sin [offering] be killed before the Lord; and that was on the north side of the altar, see Leviticus 1:11 and so Aben Ezra and Ben Gersom observe, that the place of slaying every sin offering was the north; and some have observed that Mount Calvary, where our Lord was crucified, lay pretty much to the north of Jerusalem, see Psalms 48:2:

it is most holy; sacred to the Lord, offered up to him, and accepted by him, and typical of the most pure and holy sacrifice of Christ, who was made sin, and an offering for sin, in the room and stead of his people.