Hebrews 9:13

For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have contracted defilement make them holy so as to bring about ceremonial purity,

2 Corinthians 5:21

He has made Him who knew nothing of sin to be sin for us, in order that in Him we may become the righteousness of God.

2 Corinthians 7:1

Having therefore these promises, beloved friends, let us purify ourselves from all defilement of body and of spirit, and secure perfect holiness through the fear of God.

Hebrews 7:26

Moreover we needed just such a High Priest as this--holy, guileless, undefiled, far removed from sinful men and exalted above the heavens;

Treasury of Scripture Knowledge

Summary

And a man that is clean shall gather up the ashes of the heifer, and lay them up without the camp in a clean place, and it shall be kept for the congregation of the children of Israel for a water of separation: it is a purification for sin.

A water of separation

Bible References

Clean

2 Corinthians 5:21
He has made Him who knew nothing of sin to be sin for us, in order that in Him we may become the righteousness of God.
Hebrews 7:26
Moreover we needed just such a High Priest as this--holy, guileless, undefiled, far removed from sinful men and exalted above the heavens;
Hebrews 9:13
For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have contracted defilement make them holy so as to bring about ceremonial purity,

A water of separation

2 Corinthians 7:1
Having therefore these promises, beloved friends, let us purify ourselves from all defilement of body and of spirit, and secure perfect holiness through the fear of God.