Parashas Metzora · Passuk 15:04
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “Every bed” — this teaches that a bed under the zav conveys impurity to a person and garments, but a person under the zav does not convey impurity to a person and garments.
Asymmetry of midras under the zav
Chazal distinguish: an article of midras under the zav becomes an av hatumah for people and clothes; a person lying under the zav does not.