The New John Gill Exposition of the Entire BibleLeviticus 15:22
And whosoever toucheth anything that she sat upon…
was appropriated to her to sit upon, as the Targum of Jonathan, which
was her proper and peculiar seat, what she usually sat upon; such were
obliged to wash their clothes and bathe, as in all the above cases. See
(Leviticus 15:5,10) .