Midrasch zu Wajikra 15:20
וְכֹל֩ אֲשֶׁ֨ר תִּשְׁכַּ֥ב עָלָ֛יו בְּנִדָּתָ֖הּ יִטְמָ֑א וְכֹ֛ל אֲשֶׁר־תֵּשֵׁ֥ב עָלָ֖יו יִטְמָֽא׃
Alles, worauf sie schläft in ihrer Absonderung, ist unrein; und alles, worauf sie sitzt ist unrein.
Sifra
11) (Vayikra 15:20) "And all that she lies upon in her niddah state shall be unclean, and all that she sits upon shall be unclean": I might think that she confers tumah upon a mishkav that is not distinctive for reclining upon and upon a moshav (a seat) that is not distinctive for sitting upon. It is, therefore, written (Vayikra 15:21) "And whoever touches her (distinctive) mishkav shall wash his clothes."
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