Siman - Shabbos Daf 71

• גוררת

If one reaped and ground produce the size of a dried fig (גרוגרת) beshogegg with regards to Shabbos, but b’meizid with regard to the melachos, and then did it again but this time b’meized with regards to Shabbos and beshogegg with regards to the melachos; if it became known to him that the reaping he did b’meized with regard to Shabbos and beshogegg with regards to the melachos, and he set aside a chatas to atone for that reaping:

• Rava says it also atones for the first reaping even though the first reaping was done beshogegg with regards to Shabbos. He holds it is like two acts of eating cheilev during the same lapse of awareness. He then uses the principle of גוררת, “drawing along”, to enable the chatas to atone for the first act of grinding, since it was done with the reaping in the same lapse of awareness of Shabbos. 

• Abaye takes this a step further and says that the principle of גוררת can be used a second time and enable the first act of grinding to now “draw along” the second act of grinding, so that it too is atoned for with the same single chatas.

• Multiple prohibitions vs. multiple transgressions 

A Mishnah from Kereisos was brought that taught a stringency of multiple prohibitions over multiple transgressions. If one ate one piece of cheilev and then another in one lapse of awareness, he is only liable one chatas, but if he consumed cheilev, blood, nossar and piggul in one lapse, he is liable for each one.

It also taught a stringency of multiple transgressions over multiple prohibitions. If one eats two half kezaysim from the same prohibited food, he is liable for a chatas, whereas if he ate them from two different prohibitions, he is not liable.

• Discovery at two different times

If one ate two kezaysim of cheiliv in one lapse of awareness, but discovered them at two different times:

• Rebbe Yochanan says he liable to bring two chatas offerings, based on the passuk, "על חטאתו" "והביא"“for his sin”, “he shall bring” [an offering], indicating that he is liable to bring a chatas for each transgression.

• Reish Lakish says he is only liable one chatas based on the passuk, "מחטאתו ונסלח לו" – from his sin, and it will be forgiven for him, indicating that even if the chatas was brought for some of his sins, he is totally forgiven.