Islam and Judaism hark back to a common ancestor, Abraham (Ibrahim), and thus are referred to as Abrahamic religions (along with Christianity). Further, Muslims believe in all the prophets of Judaism, such as Isaac (Ishaq) and Moses (Musa), all of whom are mentioned in the Qur’an, peace be upon them. While Jews trace their geneology to Isaac, Muslims have descended from Ishmael (Ismail), his half-brother, peace be upon them.
Not surprisingly, then, the two faiths are quite similar when it comes to their fundamental religious outlook, structure, jurisprudence and practice.
A Shared Golden Age, A History of Judeo-Muslim Relations in Spain