Hebrews 2:13 - Matthew Poole's English Annotations on the Holy Bible

And again, I will put my trust in him: this is a further proof that Christ's sanctified ones are his brethren, his exercising himself in a necessary work proper to that brotherhood only. They are all of the household of faith, Galatians 6:10; their business is to believe in God. All who do so, are brethren; Christ doth so, and so is a Brother to them; he and they rely on one and the same God and Father to both: he did believe, confide, and rest on God, that he would help his humanity to go through all his works and sufferings to the perfecting of that of redemption. Some say he spake this in the person of David in Psalms 18:2, because Psalms 18:49 is applied to Christ by the Spirit in Romans 15:9. But others think that Psalm is not so properly understood of Christ, and that these words are not found in the Septuagint, which the apostle frequently useth, as being most familiar with these Hebrews; but that these words of his trusting in God, and of his children, are to be found near together in Isaiah 8:17,18, which chapter is a clear prophecy of this God-man the Redeemer, and punctually fulfilled by him on earth. This seems most rationally to be the place the apostle refers as to both these texts. And again, Behold I and the children which God hath given me: this is the third proof, which, though it be literally Isaiah's words, who complained how himself and the children of God in his days were scorned by the world for cleaving to him, yet herein was he a type of Christ, and in him was it eminently fulfilled. This the word Behold intimates, it being a matter of great weight and importance, to be attended, to be considered and unstood, by the church. I and the children which God hath given me; I and my brethren, children of the same heavenly Father, 1 Thessalonians 11:52, 1 Thessalonians 20:17 1 John 3:1; which my Father of free grace chose and delivered on my purchase, and whom he had fitted and wrought by his Spirit, to be brought home by him unto glory, though they were the wonder and contempt of this world, 1 Thessalonians 17:2,6,8,9,11,19,22,24.