Hebrews 10

As Paul reviews the Jewish traditions of blood sacrifices, he explains to the Hebrews that in all their religious practices -

"...it is not possible that the blood of bulls and of goats should take away sins..." (New Testament Hebrews 10:4)

It was the practice of blood sacrifices that was to help the people remember and be focused on that which was yet to come as -

"...we are sanctified through the offering of the body of Jesus Christ once for all..." (New Testament Hebrews 10:10)

For -

"...this man...offered one sacrifice for sins for ever...For by one offering he hath perfected for ever them that are sanctified." (New Testament Hebrews 10:12 - 14)

For the Savior promised a new and everlasting covenant, -

"...the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;
17 And their sins and iniquities will I remember no more." (New Testament Hebrews 10:16 - 17)

Which allows us as -

"...brethren, boldness to enter into the holiest by the blood of Jesus,
20 By a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh;
21 And having an high priest over the house of God..." (New Testament Hebrews 10:19 - 21)

From the beginning, the Lord instructed Adam -

"For by the water ye keep the commandment; by the Spirit ye are justified, and by the blood ye are sanctified..." (Pearl of Great Price Moses 6:60)

Sanctification is something that happens after are sins are washed away. The Savior explains sanctification as he taught his disciples -

"Now this is the commandment: Repent, all ye ends of the earth, and come unto me and be baptized in my name, that ye may be sanctified by the reception of the Holy Ghost, that ye may stand spotless before me at the last day." (Book of Mormon 3 Nephi 27:20)

The Holy Ghost is able to sanctify us due to the atonement of Jesus Christ as Moroni teaches -

"...if ye by the grace of God are perfect in Christ, and deny not his power, then are ye sanctified in Christ by the grace of God, through the shedding of the blood of Christ, which is in the covenant of the Father unto the remission of your sins, that ye become holy, without spot.
(Book of Mormon Moroni 10:33)

It is the power of His grace that transforms us, where men and women are -

"...changed from their carnal and fallen state, to a state of righteousness, being redeemed of God, becoming his sons and daughters;
26 And thus they become new creatures..." (Book of Mormon Mosiah 27:25 - 26)

Sanctification is becoming new creatures! Elder Bruce R. McConkie taught -

“To be sanctified is to become clean, pure, and spotless; to be free from the blood and sins of the world; to become a new creature of the Holy Ghost, one whose body has been renewed by the rebirth of the Spirit. Sanctification is a state of saintliness, a state attained only by conformity to the laws and ordinances of the gospel. The plan of salvation is the system and means provided whereby men may sanctify their souls and thereby become worthy of a celestial inheritance. . . .

. . . Those who attain this state of cleanliness and perfection are able, as occasion may require, to see God and view the things of his kingdom. (D. & C. 84:23; 88:68; Ether 4:7.) The Three Nephites ‘were sanctified in the flesh, that they were holy, and that the powers of the earth could not hold them.’ (3 Ne. 28:39.)” (McConkie, Mormon Doctrine, pp. 675–76.)