וְאִ֨ם עַֽל־הַמִּשְׁכָּ֜ב ה֗וּא א֧וֹ עַֽל־הַכְּלִ֛י אֲשֶׁר־הִ֥וא יֹשֶֽׁבֶת־עָלָ֖יו בְּנָגְעוֹ־ב֑וֹ יִטְמָ֖א עַד־הָעָֽרֶב׃
And if he be on the bed, or on any thing whereon she sitteth, when he toucheth it, he shall be unclean until the even.
Targum Jonathan on Leviticus
And if the effusion of her body be upon her bed, or on a thing upon any part of which she sitteth, what time any one toucheth it, he shall be unclean until evening.