Aṣ-ṣaḥābah (Arabic: الصحابة, "The Companions") were the companions of the Islamic prophet Muhammad (peace be upon him) who had seen or met him, believed in him at the time when he was alive and also died as Muslims. While all the Sahabah are very important in the Islamic faith, there are some which are especially notable and important. These include the first 4 Caliphs: Abu Bakr, Umar, Uthman, Ali.