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ומצות אפה ויאכלו. מפני שלא הביאו הלחם בסעודת אברהם באר כאן ומצות אפה ויאכלו, כי בכאן אכלו לחם ושם היה הבשר מסתלק ראשון כקרבן הקרב על גבי המזבח. ומצות אפה ויאכלו, “and he had baked unleavened bread, and they ate.” The reason the Torah mentions the kind of bread being served was to contrast it with the fact that Avraham never did serve bread to the angels. Here the Torah wanted to alert us to this. Here the angels did eat the bread as opposed to the meat which disappeared when it was served by Avraham to the angels. The “meal” when the angels were at Avraham’s resembled a sacrifice on the altar (compare our comments on 18,8).