Hebrews 5:3

And by reason hereof i.e. because of this moral weakness.

he ought He is bound not merely as a legal duty, but as a moral necessity.

so also for himself The Law assumed that this would be necessary for every High Priest (Leviticus 4:3-12). In the High Priest's prayer of intercession he said, "Oh do thou expiate the misdeeds, the crimes, and the sins, wherewith I have done evil, and have sinned before Thee I and my house!" Until he had thus made atonement for himself, he was regarded as guilty, and so could not offer any atonement for others who were guilty (Leviticus 4:3; Leviticus 9:7; Leviticus 16:6, and comp. Hebrews 7:27).

to offer for sins The word "offer" may be used absolutely for "to offer sacrifices" (Luke 5:14); but the words "for sins" are often an equivalent for "sin-offerings" (see Hebrews 10:6; Leviticus 6:23; Numbers 8:8, &c).