וְכָל־הַנֹּגֵ֖עַ בְּמִשְׁכָּבָ֑הּ יְכַבֵּ֧ס בְּגָדָ֛יו וְרָחַ֥ץ בַּמַּ֖יִם וְטָמֵ֥א עַד־הָעָֽרֶב׃
And whosoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the even.
Read halakhic rulings (Jewish law) on Leviticus 15:21: and classical halakhic sources.