Targum zu Bereschit 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.