“Take Aharon and his sons with him, and the garments, and the anointing oil, and the bull of the sin offering, and the two rams, and the basket of unleavened bread,
And Mosheh said to Aharon, “Go to the altar, and prepare your sin offering and your burnt offering, and make atonement for yourself and for the people. And make the offering of the people, and make atonement for them, as יהוה has commanded.”
So in every way He had to be made like His brothers, in order to become a compassionate and trustworthy High Priest in matters related to Elohim, to make atonement for the sins of the people.
who does not need, as those high priests, to offer up slaughter offerings day by day, first for His own sins and then for those of the people, for this He did once for all when He offered up Himself.
which was a parable for the present time in which both gifts and slaughters are offered which are unable to perfect the one serving, as to his conscience,