Parallel
Numbers 19:12
Brenton's English Septuagint · Berean Standard Bible
He shall be purified on the third day and the seventh day, and shall be clean; but if he be not purged on the third day and the seventh day, he shall not be clean.
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.