Hebrews 10:6-10
Heb 10:6 (KJB)
In burnt offerings and sacrifices for sin thou hast had no pleasure.
Pleasure - Delight in, approve, or consent
Since the animal sacrifices could not remove the sins of the supplicants, they still had the stench of sin upon them even though they were atoned for. Since these things were only a shadow, they could not please God by removing the sins and making the supplicants totally sin free. Their inability to appease Godís wrath against sin and the sinner made the animal sacrifices something which God could take no pleasure in. He could not approve of them because of their deficiency in making the supplicant perfect before Him. That is why they are only referred to as a shadow.
Heb 10:7 (KJB)
Then said I, Lo, I come (in the volume of the book it is written of me,) to do thy will, O God.
Volume - Roll, scroll, volume of a book, or summary or contents of a chapter
(Psa 40:7 KJV) Then said I, Lo, I come: in the volume of the book it is written of me, Psalm 40:7 and Hebrews 10:7 are the same in essence and give us the reason why the Scriptures were written. Both the Old and New Testaments were written about the Lord Jesus Christ. The Old Testament Scriptures were not designed to be used to make an idol out of the modern nation of Israel which is happening in the majority of churches today. In the Old Testament the sacrifices looked forward to the time when Christ would come to earth and be clothed in a body and would die for the sins of the Elect. Christ would die because it was the will of God that it should happen. (Isa 53:10 KJV) Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand. When Christ died, that signaled the end of the Levitical sacrificial system and the end of the first covenant which we already read that it was waxing old and ready to vanish. (Heb 8:13 KJV) In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away. Christ established the New Covenant with the sacrifice of Himself and that New Covenant shall never wax old because it is eternal in comparison to the first covenant which was temporary. (Heb 7:25 KJV) Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them. Under the New Covenant the supplicant was saved to the uttermost and that means they went from being a sinner to a Saint and that transformation could never take place under the first covenant.
Heb 10:8 (KJB)
Above when he said, Sacrifice and offering and burnt offerings and offering for sin thou wouldest not, neither hadst pleasure therein; which are offered by the law;
The writer is repeating verse 5 and 6 to ensure that the reader understands the vast difference between the Old and the New Covenant. God had only required these offering for the specific purposes in Israel and it was never supposed to be a permanent system. They had kept the sin of Israel in remembrance but they never had the power to remove the sins of Israel. This is why God took no pleasure in them.
Heb 10:9 (KJB)
Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.
Taketh away - Abolish or do away with
When the Lord Jesus Christ came on the scene, He had come to do the will of the Father concerning the salvation of those He named in His last Will and Testament. (Luke 22:42 KJV) Saying, Father, if thou be willing, remove this cup from me: nevertheless not my will, but thine, be done. Jesus came to abolish the Levitical system of animal sacrifices by means of becoming the sacrifice for His people. No longer will there be any need for the priesthood for sacrifices because now when the Lord Jesus Christ became the sacrifice, he opened the way to the Father, which was through Him, and those whom He saved had their sins removed which is something that could not be accomplished under the Old Covenant. When the veil inside the temple was torn from top to bottom on the day of Christís crucifixion, that was the official end of the Levitical system.
Heb 10:10 (KJB)
By the which will we are sanctified through the offering of the body of Jesus Christ once for all.
Sanctified - Made holy or set apart
Here is the reason that God sent Jesus to do His Will. Those who become saved through the Lord Jesus Christ are sanctified unto the Lord eternally which means that the sacrifice of Christ was eternally effectual in the life of the believer and His sacrifice was done only once and never to be repeated. Christ had offered His body as the final and eternal sacrifice for sin which removed sin from the believer forever.