John Gill Commentary Leviticus 15:23

"And if it be on the bed, or on anything whereon she sitteth, when he toucheth it, he shall be unclean until the even." — Leviticus 15:23 (ASV)

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 ^F9 speaks of menstrues as very infectious, or worse, to various creatures and things, in a natural way.

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FOOTNOTES:

• F9: Nat. Hist. l. 7. c. 15.