Parashas Metzora · Passuk 15:02
Chabad.org — English translation + Rashi
Torah Temima points to Niddah 56a (verified on the daf).
E-Daf.com — Tsurras Hadaf (size=3)
HebrewBooks / Shas PDF of the daf
English: “He is tamei” — he is tamei, but blood that issues from his mouth or from the opening of the organ is not tamei; it is pure.
Exclusion of other bloods
Chazal exclude blood from the mouth or from the urethra from the impurity of zivah; only the characteristic white discharge is tamei.