اَلْعَدَد 31:24

وَتَغْسِلُونَ ثِيَابَكُمْ فِي ٱلْيَوْمِ ٱلسَّابِعِ فَتَكُونُونَ طَاهِرِينَ، وَبَعْدَ ذَلِكَ تَدْخُلُونَ ٱلْمَحَلَّةَ».

And ye shall wash your clothes on the seventh day, and ye shall be clean, and afterward ye shall come into the camp.