Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.
Then said he - `At that very time (namely, when speaking by David's mouth in the 40th Psalm) He hath said.' The rejection of the legal sacrifices involves Jesus' voluntary offer to make the self sacrifice with which God is well pleased (for, indeed, it was God's own "will" that He came to do in offering it: so that this sacrifice could not but be well pleasing to God). Taketh away, х anairei (G337)] - 'sets aside the first;' namely, the legal system of "sacrifices," which God wills not.
The second - `the will of God' (Hebrews 10:7; Hebrews 10:9) that Christ should redeem us by His self-sacrifice.