Psalms 51:7 - Purify me with hyssop, and I will be clean. Wash me, and I will be whiter than snow.
Leviticus 15:19 - 24 - "`If a woman has a discharge, and her discharge in her flesh is blood, she shall be in her impurity seven days: and whoever touches her shall be unclean until the evening. "`Everything that she lies on in her impurity shall be unclean. Everything also that she sits on shall be unclean. Whoever touches her bed shall wash his clothes, and bathe himself in water, and be unclean until the evening. Whoever touches anything that she sits on shall wash his clothes, and bathe himself in water, and be unclean until the evening. If it is on the bed, or on anything whereon she sits, when he touches it, he shall be unclean until the evening. "`If any man lies with her, and her monthly flow is on him, he shall be unclean seven days; and every bed whereon he lies shall be unclean.
Numbers 31:19 - "Encamp outside of the camp seven days. Whoever has killed any person, and whoever has touched any slain, purify yourselves on the third day and on the seventh day, you and your captives.
Acts 21:24 - Take them, and purify yourself with them, and pay their expenses for them, that they may shave their heads. Then all will know that there is no truth in the things that they have been informed about you, but that you yourself also walk keeping the law.
Hebrews 9:13 - 14 - For if the blood of goats and bulls, and the ashes of a heifer sprinkling those who have been defiled, sanctify to the cleanness of the flesh: how much more will the blood of Christ, who through the eternal Spirit offered himself without defect to God, cleanse your conscience from dead works to serve the living God?