Just wanted to see what others thought about this case for Christians keeping the Day of Atonement - Yom Kippur.
(The actual ceremony for this day is described, in detail, in Leviticus 16.)
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The whole context of Hebrews 8, 9,10 is the ceremony of the Day of Atonement and all of the symbolism of it. And right in the middle of this, it says, �Christ was offered to bear the sins of many� (Hebrews 9:28).

In Heb. 10:11, "Every priest stands daily ministering an offering often times the same sacrifices," which can never take sins away. One should understand that the priest is in the Temple, working like mad, killing animals and sprinkling blood (Leviticus 16). Hebrews says it can't take away sins. But this man can, that is Jesus Christ, after he had offered one sacrifice for sins forever! Jesus� sacrifice for sins took place one time - forever! And that's all.

"Having therefore, brethren, boldness to enter into the Holiest by the blood of Jesus." --- It's a clear reference to the Day of Atonement, the high priest going into the holiest place. --- "By a new and living way which he has consecrated for us through the veil, that is to say, through his flesh. And having a High Priest over the house of God let us draw near with a true heart and full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water " (Hebrews 10:19-22).

Do we realize all this sprinkling and all this washing are all allusions to the ceremonies of the Day of Atonement? The priest had to wash his whole body about ten times. The fit man that carried the goat out into the wilderness and let him go out there had to come back, take off his clothes, wash his flesh in pure water. So there was washing and sprinkling and he (the writer of Hebrews) is still using all the allusions of the Day of Atonement.

(Heb. 10:23-25) "Let�s hold fast the profession of our faith without wavering; (for he is faithful that promised And let us consider one another to provoke unto love and to good works, not forsaking the assembling of ourselves together�."
Paul doesn't say "it's the Day of Atonement," but the entire context of three chapters (Hebrews 8,9,10) is the Day of Atonement and the High Priesthood of Jesus Christ.

Why then would anyone assume that we are allowed to forsake the assembling of ourselves together on the Day of Atonement? Why, if Jesus' disciples were to fast any time, why not on the Day of Atonement? For the whole day is about Jesus Christ and his work, and his sacrifice for us. Of all people in the world who would want to keep the Day of Atonement, Christians ought to. Paul says (Hebrews 10: 25), "don't forsake the assembling of ourselves together as the manner of some is, but exhort one another, so much the more as you see the day approaching.�

In Hebrews 8, 9, and 10, it's plain that Jesus becomes sin; He bears our sins; He takes them all upon Himself and He suffers; He is humiliated; He is betrayed; and He dies and He sheds His blood for our sins. He takes His blood; presents it to the Father, and makes intercession for us, and for us - makes atonement.

God has HIS mark or sign that identifies HIM.

"Truly My Sabbaths you shall keep: for it is a sign between ME and you....that you may know that I am the Lord that sanctifies you" (Exodus 31:13).

"Jude, the servant of Jesus Christ, and brother of James, to them that are sanctified by God the Father..." (Jude 1).

"...but you are washed, but you are sanctified....in the name of the Lord Jesus, and by the Spirit of our God" (1Cor. 6:11).