Hebrews 10:12

“But this man, etc..] Jesus Christ, for he is a man, though not a mere man; or this great high priest, who came to do the will of God, and whose body was offered once for all: after he had offered one sacrifice for sins; the sacrifice of himself, body and soul, and this but once: for ever sat down on the right hand of God; as having done his work effectually, and that with acceptance; and therefore is placed as a token of honour at the right hand of God, where he sits enjoying rest, ease, and pleasure, and that for ever; all which is opposed to the priests under the law; they were many, he but one; they offered many sacrifices, he but one; they offered theirs often, every day, he but once;…”

“this man--emphatic (Heb 3:3). for ever--joined in English Version with "offered one sacrifice"; offered one sacrifice, the efficacy of which endures for ever; literally. "continuously," (compare Heb 10:14). "The offering of Christ, once for all made, will continue the one and only oblation for ever; no other will supersede it" [BENGEL]. The mass, which professes to be the frequent repetition of one and the same sacrifice of Christ's body, is hence disproved. For not only is Christ's body one, but also His offering is one, and that inseparable from His suffering (Heb 9:26). The mass would be much the same as the Jewish sacrifices which Paul sets aside as abrogated, for they were anticipations…”

“But this man - The Lord Jesus. The word “man” is not in the original here. The Greek is literally “but this;” to wit, this priest. The apostle does not state here whether he was a man, or a being of a higher order. He merely mentions him as a priest in contradistinction from the Jewish priests. After he had offered one sacrifice for sins - By dying on the cross. This he did but once; this could not be repeated; and need not be repeated, for it was sufficient for the sins of the world. For ever sat down - That is, he sat down then to return no more for the purpose of offering sacrifice for sin. He will no more submit himself to scenes of suffering and death to expiate human guilt. On the…”

“But he - The virtue of whose one sacrifice remains for ever. Sat down - As a son, in majesty and honour. Hebrews 10:13”

“10:12-13 Christ’s sacrifice contrasts with that of the earthly high priests in that he offered himself to God as a . . . sacrifice, rather than offering animal sacrifices. • After the sacrifice was accomplished, he sat down in the place of honor (see Ps 110:1). Instead of standing daily like the priests of the old covenant (Heb 10:11), he waits until his enemies are humbled and made a footstool under his feet (Ps 110:1).”

“Heb 1:3, Heb 8:1, Heb 9:12; Act 2:33, Act 2:34; Rom 8:34; Col 3:1 Hebrews 10:13”