Genèse 14:13

And Og came, who had been spared from the giants that died in the deluge, and had ridden protected upon the top of the ark, and sustained with food by Noah; not being spared through high righteousness, but that the inhabitants of the world might see the power of the Lord, and say, Were there not giants who in the first times rebelled against the Lord of the world, and perished from the earth? But when these kings made war, behold, Og, who was with them, said in his heart, I will go and show Abram concerning Lot, who is led captive, that he may come and deliver him from the hands of the kings into whose hands he has been delivered. And he arose and came, upon the eve of the day of the Pascha, and found him making the unleavened cakes. Then showed he to Abram the Hebrew, who dwelt in the valleys of Mamre Amoraah, brother of Eshkol and brother of Aner, who were men of covenant with Abram.

ויגד לאברם העברי, this refugee had no idea that Lot was related to Avram. He only knew that Lot’s religious beliefs were similar to those of Avram.

והוא שוכן באלוני ממרא, this is why Aner, Eshkol, and Mamre participated in the war with Avram, and why he insisted in verse 24 that they receive their share of the loot.

ויבא הפליט, after that individual had escaped from captivity he came and told Avram that his nephew had been taken captive, also.

העברי, a member of the tribe of Ever, he and all his descendants proudly regarded Ever as their ancestor. They were the only people who still spoke Hebrew, the original language of man. Subsequent descendants, other than the line which ran through Avraham and the Israelites, changed their language to Aramaic, and were called Aramim, i.e. members of the people of Aram, in recognition of their specific language. Even Lavan, a third or fourth generation descendant of Ever, was already known as לבן הארמי, Lavan who spoke Aramaic. The tribe called עברים was Yaakov and his offspring.

והא שוכן באלוני ממרא, this escaped captive lived with the brothers who were allies of Avram and had helped him. He lived on the lands of one of the brothers i.e. that of Mamre.

ויבא הפליט, “the one who had escaped (from the armies that captured Sodom and its satellites) came,” (and reported on the battle to Avraham) It was the angel Michael who told Avraham. If so, why is he referred to as if a human being who had escaped from Sodom? [According to a comment in a book by Rabbi Reuven Margolies, called Malachey elyon, in which the names and functions of all the angels about whom we have some information are listed (131), Michael is an alternate name for Mattatron, often cited in kabalistic literature, as G–d’s “general manager” in matters relating to earth,” with especial concern for the Jewish people and their well wishers. Ed.] As to the reason why he is called by the strange name פליט, “refugee, escapee,” according to a tradition, when G–d dispatched Samael and his forces to earth from heaven, Samael being another name for the perennial Satan, the latter tried to force Michael to go down to earth with him, and G–d at the last moment took hold of his wing in order to keep him in the celestial spheres. Ever since then, the angel Michael has acquired the nickname פליט, “escapee.” Concerning this escapee, the prophet Ezekiel in Ezekiel 33,21, says: בא אלי הפליט מירושלים לאמור הכתה העיר, “the angel Michael came to me to inform me that Jerusalem had been conquered by the Babylonians.” The prophet then is assigned a task by G–d.