Kommentar zu Zavim 1:3

הרי זה זב גמור – and he is liable for a sacrifice, for the All-Merciful suspended it/hung it upon appearances, as it is written (Leviticus 15:3): “the impurity from his discharge”/"טומאתו בזובו", and the impurity is dependent upon his discharge, but it is not dependent upon the days. However, when there is an interruption in-between as the School of Hillel states above (in Tractate Zavim, Chapter 1, Mishnah 2), he is not a complete Zav, and the appearances do not combine, there is no difference regarding the matter of impurity as for example, that he saw two appearances alone with the interruption of the day in-between and there is no difference regarding the matter of a sacrifice, as for example that he saw three appearances [of emissions].

If he saw one issue on one day and two on the next day, or two on one day and one on the next day, or three on three [consecutive] days, or three nights, he is a full zav. This mishnah lays out the bottom line rule with regard to what is required for a person to become a full zav. If he has a three discharges on up to three days or nights straight, no matter what the combo, he is a full zav. He must bring a sacrifice at the end of his period of cleanness. We should note that this is different from a zavah. For a woman to become a zavah she must have non-menstrual blood flow on three consecutive days. Three times on one day does not make her a zavah.