Abu Hajal Muslim ibn Awsaja was a companion of what prophet who was the founder of islam, and who united Arabia into a single Muslim polity?
Muhammad Muhammad (Arabic: محمد‎ ‎ ; ] ; c. 570 CE – 8 June 632 CE) is the prophet and founder of Islam. According to Islamic doctrine, he was God's Messenger, sent to confirm the essential teachings of monotheism preached previously by Adam, Abraham, Moses, Jesus, and other prophets. He is viewed as the final prophet of God in all the main branches of Islam, though some modern denominations diverge from this belief. Muhammad united Arabia into a single Muslim polity and ensured that his teachings, practices, and the Quran formed the basis of Islamic religious belief.
Salaf Salaf (Arabic: سلف‎ ‎ , "ancestors" or "predecessors"), also often referred to with the honorific expression of "al-salaf al-ṣāliḥ" (Arabic: السلف الصالح‎ ‎ , "the pious predecessors") are often taken to be the first three generations of Muslims, that is the generations of the Islamic Prophet Muhammad and his companions (the Sahabah), their successors (the Tabi‘un), and the successors of the successors (the Taba Tabi‘in).