Side-ring EXTRA · Rashi on extended midras
Rashi on Vayikra 15:23 (commenting on the continuation that still governs the same midras of 15:20–22).
English: “And if it is on the bed” — one who lies or sits on her bed or on her seat, even without touching her, is under the same impurity stated in the preceding verses, which require laundering of clothes.
Midras without direct contact
Rashi makes explicit what 15:20–22 already imply: pressure on her midras articles conveys impurity even without touching her body.