Date: 26 Adar II 5597
From: Rabbi Moshe Sofer
To: Rabbi Elazar Segal Horowitz
The responsum addresses a query about the necessity of an oath for witnesses in Jewish law, clarifying that witnesses are generally not required to swear, and discusses the principle of 'shaveh nafshih haticha d'isura' (one who makes himself a forbidden object) in the context of testimony.
Source: Shu"t Chasam Sofer CM §207