English: From here [we learn] that Yosef’s portion was a double portion relative to one [brother], and not a double portion of the entire estate.
On the daf / in context: The Gemara discusses the nature of the bechorah that was transferred from Reuven to Yosef. The verse “one portion above thy brethren” establishes that Yosef received a double share relative to a single ordinary share, not twice the whole of the remaining property.
Type of Learning
Halachic derivation from the verse — the language “one portion above” defines the measure of the first-born’s double share.
What Is Learned
The bechor receives a double portion calculated as two ordinary shares, not as half of the entire estate. Yaakov’s gift of Shechem to Yosef illustrates this principle.