Date: 6 Tevet 5593
From: Rabbi Moshe Sofer
To: Rabbi Shmuel Pinchas
The responsum discusses the halachic permissibility of a farmer selling two cows to a non-Jew before they gave birth, raising questions about the status of the firstborn animals and the validity of the sale given the laws of 'bekhorah' (firstborn offering).
Source: Shu"t Chasam Sofer Collected §28