In burnt-offerings and sacrifices for sin thou hast had no pleasure - This is not quoted literally from the Psalm, but the sense is retained. The reading there is, "burnt-offering and sin-offering hast thou not required." The quotation by the apostle is taken from the Septuagint, with the change of a single word, which does not materially affect the sense - the word ὀυκ ἐυδόκησας ouk eudokēsas - "ouk eudokesas" - "thou hast no pleasure," instead of ὀυκ ἠθέλησας ouk ēthelēsas - "ouk ethelesas" - "thou dost not will." The idea is, that God had no pleasure in them as compared with obedience. He preferred the latter, and they could not be made to come in the place of it, or to answer the same purpose. When they were performed with a pure heart, he was doubtless pleased with the offering. As used here in reference to the Messiah, the meaning is, that they would not be what was required of "him." Such offerings would not answer the end for which he was sent into the world, for that end was to be accomplished only by his being "obedient unto death."

Thou hast had no pleasure - Thou couldst never be pleased with the victims under the law; thou couldst never consider them as atonements for sin; as they could never satisfy thy justice, nor make thy law honorable.

In burnt offerings and sacrifices for sin,.... Which were the principal kinds of offerings under the law:
thou hast had no pleasure; not only in comparison of moral duties, or spiritual sacrifices, such as those of praise and thanksgiving, Psalm 69:30 but so as to accept of the offerers for the sake of them, and smell a sweet savour in them; for these could not satisfy his justice, appease his anger, or expiate sin; and when they were in full force, and offered in the most agreeable manner, they were no otherwise well pleasing to God, than as they were types of, and had respect unto the sacrifice of his Son. In the Hebrew text it is, "thou didst not require, or ask for"; for them, when the time was up that Christ should come into the world.

burnt offerings--Greek, "whole burnt offerings."
thou hast had no pleasure--as if these could in themselves atone for sin: God had pleasure in (Greek, "approved," or "was well pleased with") them, in so far as they were an act of obedience to His positive command under the Old Testament, but not as having an intrinsic efficacy such as Christ's sacrifice had. Contrast Matthew 3:17.