There is no doubt that Adnan is from the lineage of Ishmeal, the only fact that is disagreed upon (or being disputed) is the number of ancestors between the two. Most of what was said (and known) is that the exact number is forty fathers between Adnan and Ishmeal, and this is (largely) based on what is written among the Christian and Jewish people, who know it from Baruch (the Israelite scribe, disciple, and secretary of Jeremah) writer of The Book of Jeremiah ... And Abu Jafar Al Tabari, and others, have concluded that the almighty God had sent to Jeremiah son of Hilkiah a revelation to go to (the King of Babylon) Nebuchadnezzar (II) and inform him that the almighty God has given him authority over the (ancient) people of Arabia (the Qedarites). God then commanded Jeremiah to take Ma'ad son of Adnan (far away from the imminent conflict) on (a horse). So that he, (Ma'ad), will not be afflicted by any resentfulness (since the victims cursed by the evils of Nebuchadnezzar were his people). (As the command stated) For I, the almighty God, will bring forth from him (Ma'ad son of Adnan) a generous prophet, and the last among prophets. Jeremiah accepted the request, and carried Ma'ad to the land (known as) the levant, where he grew among the sons of Israel; the few whom survived after the destruction of the Temple in Jerusalem ... The scribe who wrote the Book of Jeremiah, Baruch, transcribed the genealogy of his master (and devoted friend) to have it preserved (with the books) in the library of Jeremiah, and to save the lineage of Ma'ad (perhaps for posterity and future generations), but God only knows (the exact truth). This is the reason why Mailk (a primary scholar of prophetic traditions in the 8th century) disliked tracing the lineage to before Adnan (or attempt to name any of forefathers of Adnan, other than Ishmael himself, because no truthful or precise record exists of these ancestors, save the Book of Jeremiah).The tribes of the northern Arabian Peninsula are descended from Ishmael. They are seldom referred to as the Ishmaelites, however, but are more often described as the Qays ʿAylān. The southern tribes are descended from Qahtan, also known as Qahtanites. During the Umayyad era, a feud began between them. Scottish historian W. Montgomery Watt wrote that to constitute something like a political party, the tribes began to identify the people of the Arabian Peninsula as Qays ʿAylān or Qahtan. The rivalry led to open conflict during the Second Muslim Civil War (680-692).