New Revised Standard Version
Then someone who is clean shall gather up the ashes of the heifer, and deposit them outside the camp in a clean place; and they shall be kept for the congregation of the Israelites for the water for cleansing. It is a purification offering.

Contemporary English Version
A man who isn't unclean must collect the ashes of the burnt cow and store them outside the camp in a clean place. The people of Israel can mix these ashes with the water used in the ceremony to wash away sin.

New American Bible
Then somebody who is clean shall gather up the ashes of the heifer and deposit them in a clean place outside the camp. There they are to be kept to prepare purification water for the Israelite community. This is a purification offering.

Douay-Rheims Bible
And a man that is clean shall gather up the ashes of the cow, and shall pour them forth without the camp in a most clean place, that they may be reserved for the multitude of the children of Israel, and for a water of aspersion: because the cow was burnt for sin.

And a man that is clean shall gather up the ashes of the cow, and shall pour them forth without the camp in a most clean place, that they may be reserved for the multitude of the children of Israel, and for a water of aspersion: because the cow was burnt for sin.

clean

Numbers 19:18 And a man that is clean shall dip hyssop in them, and shall sprinkle therewith all the tent, and all the furniture, and the men that are defiled with touching any such thing:

Numbers 9:13 But if any man is clean, and was not on a journey, and did not make the phase, that soul shall be cut off from among his people, because he offered not sacrifice to the Lord in due season: he shall bear his sin.

2 Corinthians 5:21 Him, who knew no sin, he hath made sin for us: that we might be made the justice of God in him.

Hebrews 7:26 For it was fitting that we should have such a high priest, holy, innocent, undefiled, separated from sinners, and made higher than the heavens:

Hebrews 9:13 For if the blood of goats and of oxen, and the ashes of an heifer, being sprinkled, sanctify such as are defiled, to the cleansing of the flesh:

lay them up

Numbers 19:17 And they shall take of the ashes of the burning and of the sin offering, and shall pour living waters upon them into a vessel.

a water of separation.

Numbers 9:13,14 But if any man is clean, and was not on a journey, and did not make the phase, that soul shall be cut off from among his people, because he offered not sacrifice to the Lord in due season: he shall bear his sin. . . .

Numbers 19:13,20,21 Every one that toucheth the corpse of a man, and is not sprinkled with this mixture, shall profane the tabernacle of the Lord, and shall perish out of Israel: because he was not sprinkled with the water of expiation, he shall be unclean, and his uncleanness shall remain upon him. . . .

Numbers 6:12 And shall consecrate to the Lord the days of his separation, offering a lamb of one year for sin: yet so that the former days be made void, because his sanctification was profaned.

Numbers 31:23,24 And all that may pass through the fire, shall be purified by fire, but whatsoever cannot abide the fire, shall be sanctified with the water of expiation: . . .

Leviticus 15:20 Every one that toucheth her, shall be unclean until the evening.

Zechariah 13:1 In that day there shall be a fountain open to the house of David, and to the inhabitants of Jerusalem: for the washing of the sinner, and of the unclean woman.

2 Corinthians 7:1 Having therefore these promises, dearly beloved, let us cleanse ourselves from all defilement of the flesh and of the spirit, perfecting sanctification in the fear of God.