Numbers 19:12
You must purify yourself with the water of purification on the third day and on the seventh day, and then you will be clean. But if you don't purify yourself on the third and seventh days, you won't be clean.You must purify yourself with the water of purification on the third day and on the seventh day, and then you will be clean. But if you don't purify yourself on the third and seventh days, you won't be clean.