English: “To your brother” — and not to a non-Jew.
On the daf / in context: A further limiting derivation from the word “achikha,” reinforcing that the Torah-level obligation is directed toward a fellow Jew.
Type of Learning
Limiting derash (mi’ut) on “achikha.”
What Is Learned
The biblical commandment of returning lost property is specifically framed as an obligation toward one’s fellow Jew.