Números 19:12

12 No terceiro dia e no sétimo dia, se purificará com esta água e ficará puro; mas, se no terceiro dia e no sétimo não se purificar, não ficará puro.

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.