And by reason hereof - Because he is a sinner; an imperfect man. "As for the people, so also for himself, to offer for sins." To make an expiation for sins. He needs the same atonement; he offers the sacrifice for himself which he does for others; Leviticus 9:7. The same thing is true of the ministers of religion now. They come before God feeling that they have need of the benefit of the same atonement which they preach to others; they plead the merits of the same blood for their own salvation which they show to be indispensable for the salvation of others.

And by reason hereof - As he is also a transgressor of the commands of God, and unable to observe the law in its spirituality, he must offer sacrifices for sin, not only for the people, but for himself also: this must teach him to have a fellow feeling for others.

And by reason hereof,.... Because of his sinful infirmity:
he ought, as for the people, so also for himself to offer for sins; as he offered sacrifice for the sins of the people, so he was obliged to offer for his own sins; in this Christ differed from the high priest, for he had no sin of his own to offer for, Hebrews 7:27 but he had, and therefore offered for them, Leviticus 16:11 and made a confession of them: the form of which, as used on the day of atonement, was this;
"he put both his hands upon the bullock, and confessed, and thus he said: I beseech thee, O Lord, I have done wickedly, I have transgressed, I have sinned before thee, I and my house; I beseech thee, O Lord, pardon the iniquities, transgressions, and sins, which I have done wickedly, transgressed, and sinned before thee, I and my house.''
And this he did a second time on that day (z).
(z) Misna Yoma, c. 3. sect. 8. & c. 4. sect. 2.

by reason hereof--"on account of this" infirmity.
he ought . . . also for himself, to offer for sins--the Levitical priest ought; in this our High Priest is superior to the Levitical. The second "for" is a different Greek term from the first; "in behalf of the people . . . on account of sins."