English: It was taught: Yitzchak instituted the afternoon prayer, as it is said “And Yitzchak went out to converse in the field toward evening.” “Conversation” means only prayer, as it is said “A prayer of the afflicted when he faints and pours out his conversation before Hashem.”
On the daf / in context: The root siach is taken as prayer rather than mere strolling; the timing “toward evening” anchors Minchah as Yitzchak’s contribution among the Patriarchal prayers.
Type of Learning
Custom (Bavli — Yitzchak established Minchah)
What Is Learned
Yitzchak established the Minchah prayer; “to converse in the field toward evening” is the Torah’s record of that institution.