Sahih Muslim (Arabic: صحيح مسلم, ṣaḥīḥ Muslim, full title Al-Musnadu Al-Sahihu bi Naklil Adli) is one of the Six major collections (Al-Kutub Al-Sittah) of the hadith in Sunni Islam. It is the second most authentic hadith collection after Sahih Al-Bukhari, and is highly acclaimed by Sunni Muslims. It was collected by Muslim ibn al-Hajjaj, also known as Imam Muslim. Sahih translates as authentic or correct.

Imam Muslim (Muslim ibn al-Hajjaj) was born in 202 AH (817/18 CE) in Naysabur, Iran into a Persian family and died in 261 AH (874/75 CE) also in Nishapur. He traveled widely to gather his collection of ahadith (plural of hadith), including to Iraq, the Arabian Peninsula, Syria and Egypt. Out of 300,000 hadith which he evaluated, approximately 4,000 were extracted for inclusion into his collection based on stringent acceptance criteria. Each report in his collection was checked and the veracity of the chain of reporters was painstakingly established. Sunni Muslims consider it the second most authentic hadith collection, after Sahih Bukhari.Sahih Muslim is divided into 43 books,containing a total of 7190 narrations. However, it is important to realize that Imam Muslim never claimed to collect all authentic traditions as his goal was to collect only traditions that all Muslims should agree on about accuracy.

Muhammad Ahmad bin Abd Allah (Arabic:محمد أحمد المهدي) (August 12, 1844 – June 22, 1885) was a religious leader of the Samaniyya order in Sudan who, on June 29, 1881, proclaimed himself as the Mahdi or messianic redeemer of the Islamic faith. His proclamation came during a period of widespread resentment among the Sudanese population of the oppressive policies of the Turco-Egyptian rulers, and capitalized on the messianic beliefs popular among the various Sudanese religious sects of the time. More broadly, the Mahdiyya, as Muhammad Ahmad's movement was called, was influenced by earlier Mahdist movements in West Africa, as well as Wahabism and other puritanical forms of Islamic revivalism that developed in reaction to the growing military and economic dominance of the European powers throughout the 19th century.

From his announcement of the Mahdiyya in June 1881 until the fall of Khartoum in January 1885, Muhammad Ahmad led a successful military campaign against the Turco-Egyptian government of the Sudan (known as the Turkiyah). During this period, many of the theological and political doctrines of the Mahdiyya were established and promulgated among the growing ranks of the Mahdi's supporters. After Muhammad Ahmad's unexpected death on 22 June 1885, a mere six months after the conquest of Khartoum, his chief deputy, Abdallahi ibn Muhammad took over the administration of the nascent Mahdist state.