"To David, a psalm. The Lord says to my lord: 'Sit at my right hand until I make your enemies a footstool for your feet.' It is the verse that says (Isaiah 41:2): 'Who has stirred up one from the east, calling him in righteousness to his service? He hands nations over to him and subdues kings before him.
He turns them to dust with his sword, to windblown chaff with his bow.' The nations of the heathens were sleeping under the wings of the Shechinah (Divine Presence), and who awakened them to come and take refuge under the wings of the Shechinah? Abraham, as it says, 'Who has stirred up one from the east.' And not only that, but also righteousness was asleep and Abraham awakened it.
And how did Abraham do it? He made a lodge for travelers and opened its doors to all winds, and he received passersby and returnees, as it says (Genesis 21:33), 'And he planted a tamarisk tree in Beersheba, and there he called in the name of the Lord, the eternal God.' Rabbi Azariah said: What is 'eshel'? It is a place of eating, drinking, and escorting.
Be righteous and call it in his name. Another explanation: the righteous one of the world would accompany him. And when he came to make war with Amraphel and his companions, as it says (Isaiah 41:2), 'He makes his sword like dust,' what is meant by 'like dust'? Rabbi Judah and Rabbi Nehemiah disagreed.
Rabbi Judah said that Abraham took dust and threw it at them, and it turned into swords, and he took straw and threw it, and it turned into bows and arrows. Rabbi Nehemiah said to him: If so, you have uprooted the verse, for it is not written 'dust and straw,' but rather 'like dust and straw.' What is meant by 'like straw'? That Amraphel threw swords and they turned into dust, and he threw arrows and they turned into straw. (Isaiah 41:3) 'He pursues them and moves on unscathed.'
What is meant by 'on foot'? That he did not come with his army, but when he came to pursue them, the ground became compacted before him." Some say that Abraham's stride was three cubits long, while others say it was two, but when he walked, the ground did not even stir before him. One should not walk with dirty feet.
Rabbi Judah the son of Rabbi Abbahu said in the name of Rabbi Bibi, "The infant (Moses) walked in his home, and his feet were covered with dust, yet Abraham's feet did not become dusty. One should not walk with dirty feet." Rabbi Elazar ben Pedat said in the name of Rabbi Yose ben Zimra, "What is meant by 'walking'? When Abraham slew all those people in battle, his heart was softened, and he said, 'It cannot be that there was not a righteous person among them.'
Then God said to him, 'Abraham, you will not come to this sin with your feet.' And who fought all those battles? It was possible to conquer all of them with eighteen or three hundred men. Rabbi Yochanan, the son of Rabbi Yose, said, 'But he had only his servant Eliezer with him, whose merits were great.'
And who fought all those battles? It was God who said to him, 'Turn to your right hand,' and I will fight for you. Although it is not written here, David explained it when he said, 'The Lord said to my lord, "Sit at my right hand."' And likewise it says of the Messiah (Isaiah 16:5), 'And a throne shall be established in mercy, and he shall sit upon it in truth.'
God said, 'He will sit, and I will make war for him, so let us study and not change the Torah, which is called truth (Proverbs 23:23), "Buy truth and do not sell it." Let him sit upon it in truth.'"