Numbers 19:12

the same shall purify himself therewith on the third day, and on the seventh day he shall be clean: but if he purify not himself the third day, then the seventh day he shall not be clean.

Numbers 31:19

And encamp ye without the camp seven days: whosoever hath killed any person, and whosoever hath touched any slain, purify yourselves on the third day and on the seventh day, ye and your captives.

Exodus 19:11

and be ready against the third day; for the third day Jehovah will come down in the sight of all the people upon mount Sinai.

Exodus 19:15

And he said unto the people, Be ready against the third day: come not near a woman.

Leviticus 7:17

but that which remaineth of the flesh of the sacrifice on the third day shall be burnt with fire.

Numbers 19:17-19

And for the unclean they shall take of the ashes of the burning of the sin-offering; and running water shall be put thereto in a vessel:

Psalm 51:7

Purify me with hyssop, and I shall be clean: Wash me, and I shall be whiter than snow.

Ezekiel 36:25

And I will sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.

Hosea 6:2

After two days will he revive us: on the third day he will raise us up, and we shall live before him.

Acts 15:9

and he made no distinction between us and them, cleansing their hearts by faith.

1 Corinthians 15:3-4

For I delivered unto you first of all that which also I received: that Christ died for our sins according to the scriptures;

Revelation 7:14

And I say unto him, My lord, thou knowest. And he said to me, These are they that come of the great tribulation, and they washed their robes, and made them white in the blood of the Lamb.

Treasury of Scripture Knowledge

Summary

He shall purify himself with it on the third day, and on the seventh day he shall be clean: but if he purify not himself the third day, then the seventh day he shall not be clean.

General references

Bible References

He shall purify

Numbers 19:17
And for the unclean they shall take of the ashes of the burning of the sin-offering; and running water shall be put thereto in a vessel:
Psalm 51:7
Purify me with hyssop, and I shall be clean: Wash me, and I shall be whiter than snow.
Ezekiel 36:25
And I will sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
Acts 15:9
and he made no distinction between us and them, cleansing their hearts by faith.
Revelation 7:14
And I say unto him, My lord, thou knowest. And he said to me, These are they that come of the great tribulation, and they washed their robes, and made them white in the blood of the Lamb.

Third day

Numbers 31:19
And encamp ye without the camp seven days: whosoever hath killed any person, and whosoever hath touched any slain, purify yourselves on the third day and on the seventh day, ye and your captives.
Exodus 19:11
and be ready against the third day; for the third day Jehovah will come down in the sight of all the people upon mount Sinai.
Leviticus 7:17
but that which remaineth of the flesh of the sacrifice on the third day shall be burnt with fire.
Hosea 6:2
After two days will he revive us: on the third day he will raise us up, and we shall live before him.
1 Corinthians 15:3
For I delivered unto you first of all that which also I received: that Christ died for our sins according to the scriptures;

General references

Leviticus 7:19
And the flesh that toucheth any unclean thing shall not be eaten; it shall be burnt with fire. And as for the flesh, every one that is clean shall eat thereof:
Ezekiel 44:26
And after he is cleansed, they shall reckon unto him seven days.

American Standard Version Public Domain