טהרות ג׳:ד׳ - ג׳:ה׳

הרי אלו טהורים – an egg’s bulk they consume and it is referring to an olives’ bulk from a corpse and an olive’s bulk from a carrion and a lentil’s bulk from the a creeping insect/reptile.

הניחן בגשמים ונתפחו טמאין – for all of the measurement that we follow are after their size/greatness. And from here, we hold that there is no suspension/removal of an object from its purpose regarding prohibitions.

אם טמאות טמאות – like that which is taught further on in the Mishnah in the Chapter "השרץ והצרפדע" [Tractate Taharot, Chapter 5, Mishnah 7]: “If one touched someone at night, and it is not known if he is alive or dead, and in the morning he arose and found him dead,… the Sages declare unclean….for all unclean things [are adjudged] as they are at the time that they are found.” And specifically, in the place where they are found, to exclude if he touched someone at night in this corner and on the morrow found him dead in another corner and other things similar to it.

אם מכוסות מכוסות – as, for example, an earthenware vessel that is surrounded by an airtight lid , we don’t say that perhaps at the time that the corpse was in the tent, it was uncovered and now it is covered, or if they found it uncovered, we don’t say that perhaps at the time that the corpse (was in the tent) it was covered and surrounded by an airtight lid.

מחט שנמצאת מלאה חלודה (a needle that was found filled with mold/rust) – that prevents the sewing, for mold/rust like this purifies it from its defilement.

או שבורה טהורה - and we don’t say that perhaps that it when it was whole it was defiled, and when he would repair it and it would return whole, it would return to its earlier/older defilement, and this is the explanation – that if they are pure, they are pure, as is taught above.