Numbers 19:12

¹⁰ The man who has gathered up the ashes of the heifer must also wash his clothes, and he will be ceremonially unclean until evening. This is a permanent statute for the Israelites and for the foreigner residing among them.

¹¹ Whoever touches any dead body will be unclean for seven days.

He must purify himself with the water on the third day and on 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.

¹³ Anyone who touches a human corpse and fails to purify himself defiles the tabernacle of the LORD. That person must be cut off from Israel. He remains unclean, because the water of purification has not been sprinkled on him, and his uncleanness is still on him.

¹⁴ This is the law when a person dies in a tent: Everyone who enters the tent and everyone already in the tent will be unclean for seven days,

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: He must purify himself with the water on the third day and on 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.
KJV: 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.
WEB: He shall purify himself with water on the third day, and on the seventh day he shall be clean; but if he doesn’t purify himself the third day, then the seventh day he shall not be clean.
ASV: 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.
DARBY: 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.
BLB: He shall cleanse himself from sin with the water on the third day, and on the seventh day he will be clean. But if he does not cleanse himself from sin on the third day, and on the seventh day, he will not be clean.

ÅB: Den tredje og den syvende dag skal han rense seg med vannet,[^1] så blir han ren; men renser han seg ikke den tredje dag og den syvende dag, da blir han ikke ren.
OTB: De må rense seg med vannet på den tredje dagen og på den syvende dagen; da vil de være rene. Hvis de ikke renser seg på den tredje og syvende dagen, vil de ikke være rene.
B1930: Den tredje og den syvende dag skal han rense sig med vannet, så blir han ren; men renser han sig ikke den tredje dag og den syvende dag, da blir han ikke ren. / < renselsesvannet, 4MO 19, 9.>

Study notes (Tyndale)

Original text and word study

Cross references

Numbers 31:19
All of you who have killed a person or touched the dead are to remain outside the camp for seven days. On the third day and the seventh day you are to purify both yourselves and your captives.
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Psalms 51:7
Purify me with hyssop, and I will be clean; wash me, and I will be whiter than snow.
Read in context
Hosea 6:2
After two days He will revive us; on the third day He will raise us up, that we may live in His presence.
Read in context
1 Corinthians 15:3–4
For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,
Read in context
Acts 15:9
He made no distinction between us and them, for He cleansed their hearts by faith.
Read in context
Leviticus 7:17
But any meat of the sacrifice remaining until the third day must be burned up.
Read in context
Revelation 7:14
“Sir,” I answered, “you know.” So he replied, “These are the ones who have come out of the great tribulation; they have washed their robes and made them white in the blood of the Lamb.
Read in context
Exodus 19:15
“Be prepared for the third day,” he said to the people. “Do not draw near to a woman.”
Read in context