וירא באלוני ממרא. פירש"י הוא שנתן לו עצה על המילה. ותימה וכי אדם חשוב וצדיק כאברהם ונתנסה בעשר נסיונות ועמד בכולן ולא שאל עצה איך שאל עצה על המילה שצוהו הקב"ה. וי"ל שחס ושלום שישאל עצה אם ימול אם לאו אלא אם יעשה בצנעה או בפרהסיא וממרא נתן לו עצה לעשותה בפרהסיא כדי שיראו העולם וימולו אחריו והיינו דכתיב בעצם היום הזה נימול אברהם בעצומו של יום. ד"א ששאל לו עצה מאיזה מקום ימול והוא נתן לו עצה שימול במקום זכרות כדכתיב המול לכם כל זכר ממקום שניכר בין זכר לנקבה. ד"א כשצוה הקב"ה למול כל אנשי ביתו הלך אצל ענר ואשכול לשאול מה יעשה על אנשי ביתו שאינן רוצין להמול ולא ידעו מה להשיב לו הלך אצל ממרא ונתן לו עצה שימול עצמו וישמעאל בנו תחלה וכשיראו כן אז יקבלו להמול וכן עשה בעצם היום הזה נמול אברהם וישמעאל בנו והדר כתיב וכל אנשי ביתו נמולו אתו. ואי קשיא ממרא שנתן לו עצה מדוע לא מל עצמו לסוף נמול כדאיתא באגדה: וירא אליו ה' באלוני ממרא, “The Lord appeared to him at eloney mamre, etc.” According to Rashi, Mamre was the man who had advised Avraham strongly to carry out G–d’s command to circumcise himself. This is why this revelation took place while Avraham was on his property. The obvious question here is why someone of the stature of Avraham needed to consult with his friends about if and how to relate to G–d’s commandment. He had been tested as to his faith in Him on ten occasions, and he had passed all these tests without consulting with anyone, why would he suddenly feel the need to “consult” anyone? The answer clearly must be that Avraham did not “consult” with anyone in order to decide if to carry out G–d’s command; he only asked his friends if to perform this commandment on himself in the privacy of his tent or publicly, in order to demonstrate his loyalty to G–d’s command. His purpose in doing so publicly would be in order to encourage others to emulate his example. When the Torah described him as performing the act of circumcision בעצם היום הזה, (Genesis 17,23) these words mean: “in broad daylight, for all to see.” Mamre was given credit by G–d for having given Avraham this advice. A different interpretation of our verse: Avraham consulted with Mamre regarding the exact part of his body where the “circumcision” had to be performed. He therefore advised him to perform this operation on the organ that represented his masculinity. After all, G–d had restricted the performance of this rite to the males of the species. (17,10) He also advised him to commence with circumcising himself and his son Ishmael first. Once his slaves and friends would observe this, most of them would follow willingly without protest. The Torah testifies in chapter 17, verse 27 that all the members of Avraham’s household (including hired help) were circumcised on the same day that he was. If you were to ask why Mamre, himself, who gave Avraham this advice, did not have himself circumcised also, the answer is that eventually he did do so as reported in a Midrash.
כחום היום. שעת אכילה והיא שעה רביעית שהתחיל היום לחום ואז מאכל כל אדם. וכדפי' רב פפא בריש מסכת שבת. ועמד פתח האהל לראות אם יעבור אדם לעת מאכל ויכניסנו לביתו: כחם היום, “during the hottest part of the day.” This is the time at which people consume their lunch. This was usually during the fourth hour of the day. This is in accordance with the commentary of Rav Papa in the Talmud, tractate Shabbat folio 10. Avraham at the time was on the lookout for prospective guests at the entrance to his tent.