Hebrews 9:13

For, if the blood of goats and bulls, and the sprinkling of the ashes of a heifer, purify those who have been defiled (as far as ceremonial purification goes),

2 Corinthians 5:21

Him who never knew sin God made to be Sin, on our behalf; so that we, through union with him, might become the Righteousness of God.

2 Corinthians 7:1

With these promises, dear friends, let us purify ourselves from everything that pollutes either body or spirit, and, in deepest reverence for God, aim at perfect holiness.

Hebrews 7:26

This was the High Priest that we needed--holy, innocent, spotless, withdrawn from sinners, exalted above the highest Heaven,

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
Him who never knew sin God made to be Sin, on our behalf; so that we, through union with him, might become the Righteousness of God.
Hebrews 7:26
This was the High Priest that we needed--holy, innocent, spotless, withdrawn from sinners, exalted above the highest Heaven,
Hebrews 9:13
For, if the blood of goats and bulls, and the sprinkling of the ashes of a heifer, purify those who have been defiled (as far as ceremonial purification goes),

A water of separation

2 Corinthians 7:1
With these promises, dear friends, let us purify ourselves from everything that pollutes either body or spirit, and, in deepest reverence for God, aim at perfect holiness.