For which I have been appointed. That it may not be thought that he makes rash assertions -- as many are wont to do -- on a subject which he did not well understand, he affirms that God had appointed him for this purpose, that he might bring the Gentiles, who had formerly been alienated from the kingdom of God, to have a share in the gospel; for his apostleship was a sure foundation of the divine calling. And on this account he labors very hard in asserting it, as there are many who received it with no small difficulty. I speak the truth in Christ, I do not lie. He employs an oath, or protestation, as in a matter of extraordinary weigh and importance, that he is a teacher of the Gentiles, and that in faith and truth These two things denote a good conscience, but still it must rest on the certainty of the will of God. Thus he means, that he preaches the gospel to the Gentiles, not only with pure affection, but also with an upright and fearless conscience; because he does nothing but by the command of God.

Whereunto - Greek, "Unto which;" that is, to the bearing of which testimony I am appointed.
I am ordained - Greek, "I am placed or constituted" - ἐτέθην etethēn. The word "ordain" has now acquired a technical signification, meaning to set apart solemnly to a sacred office by the imposition of hands; but it has not that meaning here. It does not refer to the manner in which he was set apart, or to any act of others in consecrating him to this work, but merely to the fact that he had been placed in this office, or appointed to it. He refers doubtless to the fact that the Lord Jesus had designated him to this work.
A preacher and an apostle - see the 1-Corinthians 9:1-6 notes; Galatians 1:11-12 notes.
I speak the truth in Christ, and lie not - That is, by Christ; or I solemnly appeal to Christ - a form of an oath; notes, Romans 9:1. Paul makes a solemn declaration similar to this in regard to his call to the apostleship, in Galatians 1:20. For the reasons why he did it, see the notes on that verse. It is probable that there were those in Ephesus who denied that he could be an apostle, and hence his solemn declaration affirming it.
A teacher of the Gentiles - Specially appointed to carry the gospel to the Gentiles or the pagan; see the Romans 11:13 note; Galatians 2:7 note.
In faith and verity - These words mean that he was appointed to instruct the Gentiles in faith and the knowledge of the truth.

I am ordained a preacher - I am set apart, ετεθην, appointed. The word does not imply any imposition of hands by either bishop or presbytery, as is vulgarly supposed.
I speak the truth in Christ - As I have received my commission from him, so I testify his truth. I did not run before I was sent; and I speak nothing but what I have received.
A teacher of the Gentiles - Being specially commissioned to preach the Gospel, not to the Jews, but to the nations of the world.
In faith and verity - Faithfully and truly; preaching the Truth, the whole Truth, and nothing but the Truth; and this fervently, affectionately, and perseveringly.
Instead of εν πιστει, in faith, the Cod. Alexand. has εν πνευματι, in spirit. "A teacher of the Gentiles in spirit and truth."

Whereunto I am ordained a preacher, and an apostle, (I speak the truth in Christ, [and] lie not;) a teacher of the Gentiles in (c) faith and verity.
(c) Faithfully and sincerely: and by faith he means wholesome and sound doctrine, and by truth, an upright and sincere handling of it.

Whereunto I am ordained a preacher, and an apostle,.... He was ordained or appointed to be a preacher of the Gospel from all eternity, and was separated or set apart unto it in time, and was put into the ministry of it by Christ himself, and was not a common or ordinary preacher of the word, but an apostle, an extraordinary officer in the Gospel church.
I speak the truth in Christ, and lie not; which are a sort of an oath, or an appeal to Christ the omniscient God, for the truth of what he said, concerning his ordination to the Gospel; see a like phrase in Romans 9:1. The phrase, "in Christ", is left out in the Alexandrian copy, and in three of Beza's ancient copies, and in some others, and in the Vulgate Latin, Syriac, Arabic, and Ethiopic versions;
a teacher of the Gentiles in faith and verity; the Gospel of the uncircumcision, or which was to be preached to the uncircumcised Gentiles, was committed to this apostle; and his work and ministry lay among them, and therefore he is called the apostle of the Gentiles: and so he was in faith and verity; which may regard the subject matter of his teachings and ministry; it was the faith and truth of the Gospel, even the whole of it, the faith which was once delivered to the saints, and the truth as it is in Jesus; or else the character of the apostle, as a teacher, that he was a true and faithful one, who with all integrity and veracity, fully and faithfully preached the Gospel; and since he was appointed a teacher of it to the Gentiles, this is another argument why they, as well as the Jews, should be prayed for.

Whereunto--For the giving of which testimony.
I am ordained--literally, "I was set": the same Greek, as "putting me," &c. (1-Timothy 1:12).
preacher--literally, "herald" (1-Corinthians 1:21; 1-Corinthians 9:27; 1-Corinthians 15:11; 2-Timothy 1:11; Titus 1:3). He recurs to himself, as in 1-Timothy 1:16, in himself a living pattern or announcement of the Gospel, so here "a herald and teacher of (it to) the Gentiles" (Galatians 2:9; Ephesians 3:1-12; Colossians 1:23). The universality of his commission is an appropriate assertion here, where he is arguing to prove that prayers are to be made "for all men" (1-Timothy 2:1).
I speak the truth . . . and lie not--a strong asseveration of his universal commission, characteristic of the ardor of the apostle, exposed to frequent conflict (Romans 11:1; 2-Corinthians 11:13).
in faith and verity--rather, "in the faith and the truth." The sphere in which his ministry was appointed to be exercised was the faith and the truth (1-Timothy 2:4): the Gospel truth, the subject matter of the faith [WIESINGER].