Sozomenos, Historia Ecclesiastica 6.38
This is the tribe which took its origin and had its name from Ishmael, the son of Abraham; and the ancients called them Ishmaelites after their progenitor. As their mother Hagar was a slave, they afterwards, to conceal the opprobrium of their origin, assumed the name of Saracens, as if they were descended from Sara, the wife of Abraham.
Such being their origin, they practice circumcision like the Jews, refrain from the use of pork, and observe many other Jewish rites and customs. If, indeed, they deviate in any respect from the observances of that nation, it must be ascribed to the lapse of time, and to their intercourse with the neighboring nations.
Moses, who lived many centuries after Abraham, only legislated for those whom he led out of Egypt. The inhabitants of the neighboring countries, being strongly addicted to superstition, probably soon corrupted the laws imposed upon them by their forefather Ishmael. The ancient Hebrews had their community life under this law only, using therefore unwritten customs, before the Mosaic legislation. These people certainly served the same gods as the neighboring nations, honoring and naming them similarly, so that by this likeness with their forefathers in religion, there is evidenced their departure from the laws of their forefathers. As is usual, in the lapse of time, their ancient customs fell into oblivion, and other practices gradually got the precedence among them.
Some of their tribe afterwards happening to come in contact with the Jews, gathered from them the facts of their true origin, returned to their kinsmen, and inclined to the Hebrew customs and laws. From that time on, until now, many of them regulate their lives according to the Jewish precepts.
Some of the Saracens were converted to Christianity not long before the present reign. They shared in the faith of Christ by intercourse with the priests and monks who dwelt near them, and practiced philosophy in the neighboring deserts, and who were distinguished by the excellence of their life, and by their miraculous works.
It is said that a whole tribe, and Zocomus, their chief, were converted to Christianity and baptized about this period, under the following circumstances: Zocomus was childless, and went to a certain monk of great celebrity to complain to him of this calamity; for among the Saracens, and I believe other barbarian nations, it was accounted of great importance to have children. The monk desired Zocomus to be of good cheer, engaged in prayer on his behalf, and sent him away with the promise that if he would believe in Christ, he would have a son. When this promise was confirmed by God, and when a son was born to him, Zocomus was initiated, and all his subjects with him. From that period this tribe was peculiarly fortunate, and became strong in point of number, and formidable to the Persians as well as to the other Saracens. Such are the details that I have been enabled to collect concerning the conversion of the Saracens and their first bishop.
Sozomenos, Historia Ecclesiastica 6.38 = Patrologia Graeca LXVI 1411-1412
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