“The Lord appeared to him in the plains of Mamre, and he was sitting at the entrance of the tent in the heat of the day” (Genesis 18:1). “The Lord appeared to him in the plains of Mamre, and he was sitting at the entrance of the tent.” It is written: “You have given me the shield of Your salvation, and Your right hand has supported me; Your humility has made me great” (Psalms 18:36). “You have given me the shield of Your salvation” – this refers to Abraham.1As it is written: “The word of the Lord came to Abram in a vision, saying: Fear not Abram, I am a shield for you” (Genesis 15:1).
Your right hand has supported me – in the fiery furnace, in famine, and against the kings. “Your humility has rendered me great” – with what humility did the Holy One blessed be He render Abraham great? It is that he was sitting and the Divine Presence was standing [over him]. That is what is written: “The Lord appeared to him.”