According to Rav Zeira, the din of ‘Tamchuyin mechalkin’ (the manner in which the food was prepared) does not apply to produce a leniency. If the manner of preparation determines its type, how can we differentiate between kula and chumra?
Reish Lakish learns from the passuk of ‘Meichataso venislach lo’ that one korban is sufficient for both portions of chelev, although he had discovered the first one before the second. Rashi explains that the passuk teaches that even atonement on part of the sin is sufficient for the entire sin. Why is our case considered a kaparah on only a portion of an aveira?