Numbers 19:12

On the third day and on the seventh day he is to make himself clean with the water, and so he will be clean: but if he does not do this on the third day and on the seventh day, he will not be clean.

Numbers 31:19

You yourselves will have to keep outside the tent-circle for seven days, anyone of you who has put any person to death or come near a dead body; and on the third day and on the seventh day make yourselves and your prisoners clean.

Exodus 19:11

And by the third day let them be ready: for on the third day the Lord will come down on Mount Sinai, before the eyes of all the people.

Exodus 19:15

And he said to the people, Be ready by the third day: do not come near a woman.

Leviticus 7:17

But if any of the flesh of the offering is still unused on the third day, it is to be burned with fire.

Numbers 19:17-19

And for the unclean, they are to take the dust of the burning of the sin-offering, and put flowing water on it in a vessel:

Psalm 51:7

Make me free from sin with hyssop: let me be washed whiter than snow.

Ezekiel 36:25

And I will put clean water on you so that you may be clean: from all your unclean ways and from all your images I will make you clean.

Hosea 6:2

After two days he will give us life, and on the third day he will make us get up, and we will be living before him.

Acts 15:9

Making no division between them and us, but making clean their hearts by faith.

1 Corinthians 15:3-4

For I gave to you first of all what was handed down to me, how Christ underwent death for our sins, as it says in the Writings;

Revelation 7:14

And I said to him, My lord, you have knowledge. And he said to me, These are they who came through the great testing, and their robes have been washed and made 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 are to take the dust of the burning of the sin-offering, and put flowing water on it in a vessel:
Psalm 51:7
Make me free from sin with hyssop: let me be washed whiter than snow.
Ezekiel 36:25
And I will put clean water on you so that you may be clean: from all your unclean ways and from all your images I will make you clean.
Acts 15:9
Making no division between them and us, but making clean their hearts by faith.
Revelation 7:14
And I said to him, My lord, you have knowledge. And he said to me, These are they who came through the great testing, and their robes have been washed and made white in the blood of the Lamb.

Third day

Numbers 31:19
You yourselves will have to keep outside the tent-circle for seven days, anyone of you who has put any person to death or come near a dead body; and on the third day and on the seventh day make yourselves and your prisoners clean.
Exodus 19:11
And by the third day let them be ready: for on the third day the Lord will come down on Mount Sinai, before the eyes of all the people.
Leviticus 7:17
But if any of the flesh of the offering is still unused on the third day, it is to be burned with fire.
Hosea 6:2
After two days he will give us life, and on the third day he will make us get up, and we will be living before him.
1 Corinthians 15:3
For I gave to you first of all what was handed down to me, how Christ underwent death for our sins, as it says in the Writings;

General references

Leviticus 7:19
And flesh touched by any unclean thing may not be taken for food: it is to be burned with fire; and as for the flesh of the peace-offerings, everyone who is clean may take it as food:
Ezekiel 44:26
And after he has been made clean, seven days are to be numbered for him.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain