He was punished by his posterity being compelled to serve the Egyptians two hundred and ten years, because he had pressed the Rabbis under his tuition into military service in the expedition he had undertaken to recover Lot from those who had carried him off captive; for it is written (Gen. xiv. 14), "He armed his instructed." Samuel says Abraham was punished because he perversely distrusted the assurance of God; as it is written (Gen. xv. 8), "Whereby shall I know that I shall inherit it?"
Nedarim, fol. 31, col. 2.
Abraham was thrown into a fiery furnace by Nimrod, and God would not permit Gabriel to rescue him, but did so Himself; because God is One and Abraham was one, therefore it behooved the One to rescue the one.
P'sachim, fol. 118, col. 1.
The fire from which Abraham is here said to be delivered may simply refer to his deliverance by the hand of God from Ur of the Chaldees; Ur meaning "fire," and being the name of a place celebrated for fire worship. The Midrash (p. 20) says, "When the wicked Nimrod cast Abraham into the furnace, Gabriel said, 'Lord of the universe! permit me to deliver this holy one from the fire!' But the Lord made answer, 'I am the One Supreme in my world, and he is supreme in his; it is fitting therefore that the Supreme should rescue the supreme.'"
Abraham was a giant of giants; his height was as that of seventy-four men put together. His food, his drink, and his strength were in the proportion of seventy-four men's to one man's. He built an iron city for the abode of his seventeen children by Keturah, the walls of which were so lofty that the sun never penetrated them: he gave them a bowl full of precious stones, the brilliancy of which supplied them with light in the absence of the sun.
Sophrim, chap. 21.
Abraham our father had a precious stone suspended from his neck, and every sick person that gazed upon it was immediately healed of his disease. But when Abraham died, God hung up the stone on the sphere of the sun.
Bava Bathra, fol. 16, col. 2.
Till Abraham's time there was no such thing as a beard; but as many mistook Abraham for Isaac, and Isaac for Abraham, they looked so exactly alike, Abraham prayed to God for a beard to enable people to distinguish him from his son, Isaac, and it was granted him; as it is written (Gen. xxiv. 1), "And to Abraham a beard came when he was well stricken in age."