Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[263] It was now that Isaac's affairs increased, and in a flourishing condition; and this his great riches. But Abimelech, thinking in opposition to him, while their living made them suspicious of each other, and retiring showing a secret enmity also, he was afraid that his former friendship with Isaac would not secure him, if Isaac should endeavor the injuries he had formerly offered him; he therefore renewed his friendship with him, Philoc, one of his generals. And when he had obtained every thing he desired, by reason of Isaac's good nature, who preferred the earlier friendship Abimelech had shown to himself and his father to his later wrath against him, he returned home.