Numbers 19:12

he doth cleanse himself for it on the third day, and on the seventh day he is clean; and if he cleanse not himself on the third day, then on the seventh day he is not clean.

Numbers 31:19

And ye, encamp ye at the outside of the camp seven days -- any who hath slain a person, and any who hath come against a pierced one, ye cleanse yourselves on the third day, and on the seventh day -- ye and your captives;

Exodus 19:11

and have been prepared for the third day; for on the third day doth Jehovah come down before the eyes of all the people, on mount Sinai.

Exodus 19:15

and he saith unto the people, 'Be ye prepared for the third day, come not nigh unto a woman.'

Leviticus 7:17

and the remnant of the flesh of the sacrifice on the third day with fire is burnt;

Numbers 19:17-19

and they have taken for the unclean person of the ashes of the burning of the cleansing, and he hath put upon it running water unto a vessel;

Psalm 51:7

Thou cleansest me with hyssop and I am clean, Washest me, and than snow I am whiter.

Ezekiel 36:25

And I have sprinkled over you clean water, And ye have been clean; From all your uncleannesses, and from all your idols, I do cleanse you.

Hosea 6:2

He doth revive us after two days, In the third day He doth raise us up, And we live before Him.

Acts 15:9

and did put no difference also between us and them, by the faith having purified their hearts;

1 Corinthians 15:3-4

for I delivered to you first, what also I did receive, that Christ died for our sins, according to the Writings,

Revelation 7:14

and I have said to him, 'Sir, thou hast known;' and he said to me, 'These are those who are coming out of the great tribulation, and they did wash their robes, and they made their robes 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 they have taken for the unclean person of the ashes of the burning of the cleansing, and he hath put upon it running water unto a vessel;
Psalm 51:7
Thou cleansest me with hyssop and I am clean, Washest me, and than snow I am whiter.
Ezekiel 36:25
And I have sprinkled over you clean water, And ye have been clean; From all your uncleannesses, and from all your idols, I do cleanse you.
Acts 15:9
and did put no difference also between us and them, by the faith having purified their hearts;
Revelation 7:14
and I have said to him, 'Sir, thou hast known;' and he said to me, 'These are those who are coming out of the great tribulation, and they did wash their robes, and they made their robes white in the blood of the Lamb;

Third day

Numbers 31:19
And ye, encamp ye at the outside of the camp seven days -- any who hath slain a person, and any who hath come against a pierced one, ye cleanse yourselves on the third day, and on the seventh day -- ye and your captives;
Exodus 19:11
and have been prepared for the third day; for on the third day doth Jehovah come down before the eyes of all the people, on mount Sinai.
Leviticus 7:17
and the remnant of the flesh of the sacrifice on the third day with fire is burnt;
Hosea 6:2
He doth revive us after two days, In the third day He doth raise us up, And we live before Him.
1 Corinthians 15:3
for I delivered to you first, what also I did receive, that Christ died for our sins, according to the Writings,

General references

Leviticus 7:19
'And the flesh which cometh against any unclean thing is not eaten; with fire it is burnt; as to the flesh, every clean one doth eat of the flesh;
Ezekiel 44:26
'And after his cleansing, seven days they number to him.