Nidah, 55b: It comes to incorporate the Zav's urine in the Din of Zivus. ¹

Sifra: To teach us that even a Kolshehu of Zivus is Metamei. ¹

Bava Kama, 24a: It implies that, as opposed to a Zavah, whose Zivus depends on days, ¹ the Zivus of a Zav sepends on sightings ? even if they are all on the same day.

Sifra: It implies that the Tum'ah of a Zav is confined to Zivus and does not extend to blood. ²

Rashi (Shmuel 1, 21:14): It means a fluid that drips - like spit ('Rir') ¹ :

Rashi, Rashbam. R. Bachye (in Pasuk #2) and Moshav Zekenim (citing R. Nasan in Nidah 43b): The former means that the emission comes out in the form of a liquid, the latter, even if it comes out thick and stops up the hole of the Amah. ¹

Nidah, 43b (according to the Chachamim): "O Hechtim Besaro" teaches us that Zivus is only Metamei as long as it is moist, but not once it has become dry. ²

Oznayim la'Torah: "Rar Besaro" implies long, drawn-out sighting; ³ "Hechtim Besaro", a short sighting ? even comprising a Kolshehu, three of which render him a full-fledged Zav. ⁴

Nidah, 43b: It implies 'Miktzas Zovo Tamei' ? to teach us that a Zav who sees two sightings is Tamei Mishkav and Moshav.

Sifra: It implies that white Zivus is confined to a man, and the Zivus of a woman is exclusively blood.

Oznayim la'Torah: The Torah writes "Tum'aso hi" rather than 'Tamei hu' ? as it does in the previous Pasuk, in connection with a Zav who had two sightings ? because having acquired a Chezkas Tum'ah, the Tum'ah became part of him, which is why he requires a Korban when it has departed. ¹