Date: 25 Sivan 5590
From: Rabbi Moshe Sofer
To: Rabbi Nach Gavriel
The responsum discusses the obligation to honor an older brother, even if not a firstborn, deriving it from the mitzvah of honoring parents, and also addresses the question of Moses writing a Torah scroll on Shabbat.
Source: Shu"t Chasam Sofer Collected §29