Date: 22 Adar II 5580
From: Rabbi Moshe Sofer
To: Rabbi Moshe Tuvia
The responsum addresses a difficulty raised by Tosafot in Makkot 7a regarding the verse 'Lo Tachsom Shor B'disho' (do not muzzle an ox while it is threshing), and its connection to the prohibition of forcing a yevamah (sister-in-law) to marry.
Source: Shu"t Chasam Sofer Collected §15