Even after the Lord has taken his people from among the heathen and gathered them out of all countries into their own land, which is evidently the same as bringing them up out of their graves into the land of Israel. "Then, [after the resurrection and they are brought into their own land] will I sprinkle clean water upon you, and ye shall be clean;" 36:24,25 To cleanse the people, that they might be clean from all their sins "before the Lord" was the object of the atonement of the tenth day of the seventh month under the law; Lev. 16:30. The evidence is satisfactory to my mind that that day is the type of the Dispensation of the fullness of times, the age to come. What! are we to be sinful and unclean when immortal?
Let us "be patient." "The righteous shall not make haste." - The Lord says he will sprinkle them with clean water and cleanse them thereby after he has gathered them into their own land. Whether the sprinkling of water is literal figurative, it shows that he will perform a cleansing process upon them. Blood and water issued from our Savior's side.
Objects under the law were cleansed by blood and water; and we have already seen that if those objects were physically unclean, as by the leprosy or any thing else, all such uncleanness had to be removed in preparation for the cleansing. The atonement was made for the object with blood or blood and water, and the atonement cleansed them. So our Savior after he had cleansed the leper of his disease commanded him to go and offer for his cleansing; Mark 1:41-44.
So the people were themselves freed from their sins by the atonement previously made for them individually in the Holy, to prepare them for the yearly cleansing.