Hebrews 10:7

“Then said I, lo, I come, etc..] Christ observing that legal sacrifices were not acceptable to God; that there was a body prepared for him; and that it was written of him in the book of God, that he should come; and the time being now come, with a note of attention and admiration, the matter being of great moment and concern, he cheerfully expresses his readiness to come, immediately, without any compulsion, even he himself, and not another. In the volume of the book it is written of me; in the book of the law, as the, Targum and Kimchi on (<194007>Psalm 40:7 *Heb. verse 8) interpret it; and which may design the Bible in general, the whole book of the Scriptures of the Old Testament: so rps,…”

“I come--rather, "I am come" (see on Heb 10:5). "Here we have the creed, as it were, of Jesus: 'I am come to fulfil the law,' Mat 5:17; to preach, Mar 1:38; to call sinners to repentance, Luk 5:32; to send a sword and to set men at variance, Mat 10:34-35; I came down from heaven to do the will of Him that sent me, Joh 6:38-39 (so here, Psa 40:7-8); I am sent to the lost sheep of the house of Israel, Mat 15:24; I am come into this world for judgment, Joh 9:39; I am come that they might have life, and might have it more abundantly, Joh 10:10; to save what had been lost, Mat 18:11; to seek and to save that which was lost, Luk 19:10; compare Ti1 1:15; to save men's lives, Luk 9:56; to send fire…”

“Then said I - “I the Messiah.” Paul applies this directly to Christ, showing that he regarded the passage in the Psalms as referring to him as the speaker. Lo, I come - Come into the world; Hebrews 10:5. It is not easy to see how this could be applied to David in any circumstance of his life. There was no situation in which he could say that, since sacrifices and offerings were not what was demanded, he came to do the will of God in the place or stead of them. The time here referred to by the word “then” is when it was manifest that sacrifices and offerings for sin would not answer all the purposes desirable, or when in view of that fact the purpose of the Redeemer is conceived as formed to…”

“In the volume of the book - In this very psalm it is written of me. Accordingly I come to do thy will - By the sacrifice of myself. Hebrews 10:8”

“Lo: Heb 10:9, Heb 10:10; Pro 8:31; Joh 4:34, Joh 5:30, Joh 6:38 in: Gen 3:15 \*Gr. Hebrews 10:9”