From: Rabbi Moshe Sofer
To: Rabbi Leib
Rabbi Leib of Kittsee raises difficulties regarding the Gemara's analysis of offering Shabbos fats on Yom Kippur and the nature of the lachem velo le-gavoha prohibition. The Chasam Sofer explains that lachem velo le-gavoha retains lo sa'aseh character.
Source: Shu"t Chasam Sofer OC §150