New Revised Standard Version
They shall purify themselves with the water on the third day and on the seventh day, and so be clean; but if they do not purify themselves on the third day and on the seventh day, they will not become clean.

Contemporary English Version
But if you wash with the water mixed with the cow's ashes on the third day and again on the seventh day, you will be clean and acceptable for worship. You must wash yourself on those days; if you don't, you will remain unclean.

New American Bible
they shall purify themselves with the water on the third and on the seventh day, and then be clean. But if they fail to purify themselves on the third and on the seventh day, they will not become clean.

Douay-Rheims Bible
Shall be sprinkled with this water on the third day, and on the seventh, and so shall be cleansed. If he were not sprinkled on the third day, he cannot be cleansed on the seventh.

Shall be sprinkled with this water on the third day, and on the seventh, and so shall be cleansed. If he were not sprinkled on the third day, he cannot be cleansed on the seventh.

he shall purify.

Numbers 19:17,18 And they shall take of the ashes of the burning and of the sin offering, and shall pour living waters upon them into a vessel. . . .

Psalm 51:7 Thou shalt sprinkle me with hyssop, and I shall be cleansed: thou shalt wash me, and I shall be made whiter than snow.

Ezekiel 36:25 And I will pour upon you clean water, and you shall be cleansed from all your filthiness, and I will cleanse you from all your idols.

Acts 15:9 And put no difference between us and them, purifying their hearts by faith.

Revelation 7:14 And I said to him: My Lord, thou knowest. And he said to me: These are they who are come out of great tribulation and have washed their robes and have made them white in the blood of the Lamb.

third day

Numbers 31:19 And stay without the camp seven days. He that hath killed a man, or touched one that is killed, shall be purified the third day and the seventh day.

Exodus 19:11,15 And let them be ready against the third day; for on the third day the Lord will come down in the sight of all the people, upon Mount Sinai. . . .

Leviticus 7:17 But whatsoever shall be found on the third day shall be consumed with fire.

Hosea 6:2 For he hath taken us, and he will heal us: he will strike, and he will cure us.

1 Corinthians 15:3,4 For I delivered unto you first of all, which I also received: how that Christ died for our sins, according to the scriptures: . . .