English: One who writes for another that he shall be “ruler and controller over all that he has” is not using the language of a gift but the language of guardianship (apotropos), for so we find concerning Eliezer the servant of Avraham, of whom it is written “who ruled over all that he had.”
On the daf / in context: The verse is used to distinguish the language of appointment as steward from the language of absolute gift. Because Avraham later gave everything to Yitzchak, Eliezer’s “rule” could only have been fiduciary.
Type of Learning
Custom (halakhic inference — language of apotropos)
What Is Learned
Designating someone as “ruler over all that one has” creates a guardianship, not an outright gift; Eliezer’s status under Avraham is the Torah’s paradigm for that language.