Shabbos 24:4-5

Shabbos 24:4

One may chop gourds for cattle and a neveila (an animal that died without ritual slaughter) for dogs. Rabbi Yehuda says that this is prohibited if the animal was not a neveila before Shabbos because then it was not prepared for this purpose.

Shabbos 24:5

Vows may be annulled on Shabbos and one may inquire about things needed for Shabbos. One may plug a hole that admits light (to prevent the spread of ritual impurity), and one may measure a piece of cloth that came into contact with vermin (to determine if it is impure) and a mikvah (to ensure that it is large enough). An incident occurred in the days of Rabbi Tzadok’s father and Abba Shaul ben Botnis in which a light-hole was plugged with a pitcher and a pot was tied with grass in order to determine the size of a breach (vis-à-vis the spread of ritual impurity). From the fact that they permitted these things, we derive that one may plug, measure and tie for mitzvah purposes on Shabbos.
Download Audio File