Atonement is to be made once a year for all the sins of the Israelites

 Leviticus 16:23-34

Aaron, He shall bathe himself with water in the sanctuary area and put on his regular garments. Then he shall come out and sacrifice the burnt offering for himself and the burnt offering for the people, to make atonement for himself and for the people. He shall also burn the fat of the sin offering on the altar. 

The man who releases the goat as a scapegoat must wash his clothes and bathe himself with water; afterward, he may come into the camp.

The man who burns them must wash his clothes and bathe himself with water; afterward, he may come into the camp.

his is to be a lasting ordinance for you: On the tenth day of the seventh month you must deny yourselves and not do any work—whether native-born or a foreigner residing among you— because on this day atonement will be made for you, to cleanse you. Then, before the Lord, you will be clean from all your sins. It is a day of sabbath rest, and you must deny yourselves; it is a lasting ordinance. 

Atonement is to be made once a year for all the sins of the Israelites.

So year after year, Israel was reminded of the sin which cut them off from God's presence - of the need for atonement to bring forgiveness and restore relations. 

The New Testament Letter to the Hebrews sees Leviticus fulfilled in Christ. The trapping s of the first covenant is 'symbolic, point to the present time'. Christ, the high priest of the 'new covenant', has entered, not a 'sanctuary made by human hands', but 'heaven itself, to appear before God on our behalf., appearing 'once for all at the climax of history to abolish sin by the sacrifice of himself'.

Why?

The sin offering is to make atonement is to be made once a year, for it is a symbolic ceremony, until Jesus Christ who is the gift from heaven, gives us a new covenant.

Everyone who makes atonement has to wash his clothes and bathe himself with water because it is a holy work and has to erase all relative to the sin.

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如何才能成為聖潔?唯一的道路是進入至聖所。前面赦罪的道路，方法。人的責任是獻上願意悔改的心。

1.23- 28: 壇上燒油（腰子、油），在營外燒皮、肉、糞，獻上油和腰子，內心深處。身體、肉是罪身必須在營外燒掉，不能在聖所內。我們如果沒有肉身的死與皮肉糞沒有燒掉，沒有死，雖然心得救，但是肉體、舊人沒有死，因此沒有新生的樣式。

29節克苦己心，守安息日，不要工作，注重生命、不要再忙生活。克苦己心不是虐待自己，是重於安息。我們既然得到赦罪之恩，就要重視這個恩典。與耶穌基督同死同活。看與主的關係比生活更重要。

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How?

Thanks to the Lord, Jesus Christ once sacrificed himself to an everlasting atonement to all who accept Jesus and trust in Him, afterward, we could be renewed before the Lord.