Левит 15:23

Русский синодальный перевод

и если кто прикоснется к чему-нибудь на постели или на той вещи, на которой она сидела, нечист будет до вечера;

Bible Verse Review
  from Treasury of Scripure Knowledge

Gill's Notes on the Bible

And if it [be] on [her] bed, or on anything whereon she sitteth,.... That is, if any person or thing should be upon her bed or seat; a vessel on her bed, or a vessel upon a vessel, as Aben Ezra expresses it:

when he toucheth it; that person or thing that should be on her bed or seat, as well as touch her bed or seat:

shall be unclean until the even; in a ceremonial sense; so defiling was a woman in such circumstances, and to whom the Scriptures often compare unclean persons and things: and Pliny i speaks of menstrues as very infectious, or worse, to various creatures and things, in a natural way.

i Nat. Hist. l. 7. c. 15.