Quran often refers to the previous books such as Torah, Zaboor, and Injeel. Those books do contain genealogies that authenticate prophets that were sent by God. Muslims do believe that Muhammad was the prophet sent by the same God who sent the prophets that brought the previous scriptures. Muslims also believe that Muhammad was a descendent of Ishmael the first son of Abraham. My question is on what bases Muslims believe that Muhammad is a descendent of Ishmael? Where is the genealogy record that confirms Muhammad's place among Ishmael's descendants?

We have the Torah, We have the Psalms, We have the Quran, where is a copy of the Injil? Is it the same as the Bible Gospels (Matthew, Mark, Luke, and John) and if not where is the "Injil". Who can answer this question? I have done google search and found where some believe the injil is the Gospel of Jesus... some claim to be lost ... but Muhammend say believe the Torah, Pasls and Gospel.. so is the 4 gospel the injil or not.? simple/

Do Muslims believe that this book was divinely inspired? Is there contradictions between what the Quran says and what is contained in the Book of Revelations?