מקואות ו׳:ו׳ - ו׳:ז׳

עירוב מקואות – a Mikveh that is lacking [a certain amount of kosher water] that is at the side of a complete (i.e., full) Mikveh. Or alternatively, in this one (i.e, Mikveh) are twenty Seah and in that one are twenty Seah and the water intermingles through an incision or a perforation, its measure to combine them and to make them fit/kosher is as if each one has forty Seah.

כשפופרת הנוד כעוביה וכחללה (like the mouth-piece of a leather bottle in its thickness and its empty space/capacity) – of a reed that they place in the mouth of the tube. And that is like two fingers that return to their place, turning themselves around in the space in the cavity of the incision. And the two fingers that they mentioned are the two fingers adjacent to the thumb, the first ones that are in the palm of the hand, and that is a finger (i.e., index finger) and a cubit (i.e., middle finger -used to measure the cubit from the person’s elbow).

מפני שהיא מן התורה – the obligation of immersion in a Mikveh of water (see Genesis 1:10). It is from the Torah.

וכן כזית מן המת – there is doubt if they have according to the measurement and doubt if they don’t have according to the measurement, their doubtfulness makes it impure. And especially in the private domain, but in the public domain, their doubtfulness makes it pure. But even though that even according to the rabbis a doubtful of [ritual] impurity in the private domain, its doubt [makes it] impure, nevertheless, here, if these were the measurements of the Rabbis, we would purify it.

כל שיעמוד – whether dust whether stones whether red insects found in liquids (i.e., gnats) that grow in the water, if they stand on the mouth of the incision, it diminishes the mouthpiece of the leather bottle, and the Mikvaot/ritual baths do not mix/combine.

כל שהוא מבריית המים – as for example red insects found in liquids (i.e., gnats). But the Halakha is not according to Rabban Shimon ben Gamaliel.