if.

Leviticus 16:14, 16
And he is to take some of the bull's blood and sprinkle it with his finger on the east side of the mercy seat; then he shall sprinkle some of it with his finger seven times before the mercy seat. . . .

and.

Numbers 19:2-21
"This is the statute of the law that the LORD has commanded: Instruct the Israelites to bring you an unblemished red heifer that has no defect and has never been placed under a yoke. . . .

the purifying.

Numbers 8:7
This is what you must do to cleanse them: Sprinkle them with the water of purification. Have them shave their whole bodies and wash their clothes, and so purify themselves.

Numbers 19:12
He must purify himself with the water on the third day and the seventh day; then he will be clean. But if he does not purify himself on the third and seventh days, he will not be clean.

2 Chronicles 30:19
who sets his heart on seeking God--the LORD, the God of his fathers--even if he is not cleansed according to the purification rules of the sanctuary."

Psalm 51:7
Purify me with hyssop, and I will be clean; wash me, and I will be whiter than snow.

Acts 15:9
He made no distinction between us and them, for He cleansed their hearts by faith.

1 Peter 1:22
Since you have purified your souls by obedience to the truth so that you have a genuine love for your brothers, love one another deeply, from a pure heart.