English: “Who among you fears Hashem, heeding the voice of His servant” — this is Avraham. “Heeding the voice of His servant” — who heeded the voice of his servant Eliezer.
On the daf / in context: The servant’s prayer is framed by the midrash as continuous with Avraham’s own fear of Heaven; the success of the mission is the chesed shown to the master through the servant.
Type of Learning
Derash on the verse (midrash) — not a formal named middah of the 13: the prayer is linked to the verse in Yeshayahu about the servant who is heard.
What Is Learned
Eliezer prays that God deal kindly with Avraham by granting success that day; the midrash ties the prayer to the fear of Heaven that marked both master and servant.