Galatians 1:8

“But though we, or an angel from heaven, etc..] The apostle, in order to assert the more strongly the truth, purity, and perfection of the Gospel, as preached by him; and to deter persons from preaching another Gospel, and others from receiving it, supposes a case impossible; and, in such a case, denounces his anathemas. It was not possible, that he, or any of his fellow apostles, who had been so clearly led and so fully established in the Gospel of Christ, and of which they had had such a powerful and comfortable experience in their souls, could ever preach one different from it; nor was it possible that a good angel, one that is in heaven, that always beholds the face of God there, is ever…”

“But--however weighty they may seem "who trouble you." Translate as Greek, "Even though we," namely, I and the brethren with me, weighty and many as we are (Gal 1:1-2). The Greek implies a case supposed which never has occurred. angel--in which light ye at first received me (compare Gal 4:14; Co1 13:1), and whose authority is the highest possible next to that of God and Christ. A new revelation, even though seemingly accredited by miracles, is not to be received if it contradict the already existing revelation. For God cannot contradict Himself (Deu 13:1-3; Kg1 13:18; Mat 24:24; Th2 2:9). The Judaizing teachers sheltered themselves under the names of the great apostles, James, John, and…”

“But though we - That is, we the apostles. Probably, he refers particularly to himself, as the plural is often used by Paul when speaking of himself. He alludes here, possibly, to a charge which was brought against him by the false teachers in Galatia, that he had changed his views since he came among them, and now preached differently from what he did then; see the introduction. They endeavored probably to fortify their own opinions in regard to the obligations of the Mosaic law, by affirming, that though Paul when he was among them had maintained that the observance of the Law was not necessary to salvation, yet that he had changed his views, and now held the same doctrine on the subject…”

“But if we - I and all the apostles. Or an angel from heaven - If it were possible. Preach another gospel, let him be accursed - Cut off from Christ and God. Galatians 1:9”

“1:8-9 Let God’s curse fall on anyone (literally Let that person be anathema): The Greek word anathema was often used to translate the Hebrew kherem, which in the Old Testament means something dedicated to God for total destruction (see Lev 27:28-29; cp. Rom 9:3; 1 Cor 12:3; 16:22). Paul was invoking God’s strongest wrath on those who distort the Good News (Gal 1:7). • including us or even an angel from heaven: No one is authorized to change the Good News (cp. 2:6-10, 11-14).”

“though: Gal 1:9; Co1 16:22; Co2 11:13, Co2 11:14; Ti1 1:19, Ti1 1:20; Tit 3:10; Rev 22:18, Rev 22:19 let: Gal 3:10, Gal 3:13; Gen 9:25; Deu 27:15-26; Jos 9:23; Sa1 26:19; Neh 13:25; Mat 25:41; Pe2 2:14 accursed: Mar 14:71; Act 23:14; Rom 9:3; Co1 12:3, Co1 16:22 \*Gr. Galatians 1:9”