וְכָל־הַנֹּגֵ֔עַ בְּכָל־כְּלִ֖י אֲשֶׁר־תֵּשֵׁ֣ב עָלָ֑יו יְכַבֵּ֧ס בְּגָדָ֛יו וְרָחַ֥ץ בַּמַּ֖יִם וְטָמֵ֥א עַד־הָעָֽרֶב׃
And whosoever toucheth any thing that she sitteth upon shall wash his clothes, and bathe himself in water, and be unclean until the even.
Targum Jonathan on Leviticus
And whoever toucheth any thing upon which such an one hath sat shall wash his clothes, and bathe in forty seahs of water, and be unclean until evening.