Reference for Leviticus 15:11

וְכֹ֨ל אֲשֶׁ֤ר יִגַּע־בּוֹ֙ הַזָּ֔ב וְיָדָ֖יו לֹא־שָׁטַ֣ף בַּמָּ֑יִם וְכִבֶּ֧ס בְּגָדָ֛יו וְרָחַ֥ץ בַּמַּ֖יִם וְטָמֵ֥א עַד־הָעָֽרֶב׃

And whomsoever he that hath the issue toucheth, without having rinsed his hands in water, he shall wash his clothes, and bathe himself in water, and be unclean until the even.