The Mahdi Is Descended from the Line of the Prophet (saas)

Narrated by Ali (ra), the Messenger of Allah (saas) said: Even if there remains only one day for the world, Allah, the Exalted, will send a man from the Ahl al-Bayt (People of the House). (Sunan Abu Dawud, 5:92) Narrated by Said ibn al-Musayyab (ra), our Prophet (saas) said: The Mahdi is from the line of my daughter Fatima. (Sunan Ibn Majah, 10:348) Ali (ra) narrated our Prophet (saas) as saying: He is one from the Quraysh and from my Ahl al-bayt. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi, p. 13) Hear the tidings of the Mahdi. He is one from the Quraysh and from my Ahl al-Bayt. (Small Book of Portents of the Mahdi of the End Times, 13) Ibni Mas'ud narrates that the Messenger of Allah (saas) said: ".One from my Ahl al-Bayt, whose name matches mine and whose father's name matches my father's name. This individual will fill the world with justice and sovereignty, instead of the former injustice and oppression." (Tirmidhi) Days and nights will not end until one from my Ahl al-Bayt rules the entire world. (Al-Uqayli, An-Najmu's-saqib) The Mahdi is one of my children. His face is like a star shining in the sky. (Ali Ibn Sultan Muhammad al-Qaari al-Harawi al-Hanafi, Risalat Mashrab al Vardi fi Mazhabi 'l Mahdi) The Mahdi, aged 40, is one of my line. His face is like a star shining in the sky. (Ali Ibn Sultan Muhammad al-Qaari al-Harawi al-Hanafi, Risalat Mashrab al Vardi fi Mazhabi 'l Mahdi) "The Mahdi is one of my children. His face is like a bright star. " (Al-Uqayli, An-Najmu's-saqib)

All prophets are related to one another. The Mahdi will also be of that line. These descendants are popularly known as sayyid.

Related verses in the Qur'an: Our Lord, make us both Muslims submitted to You, and our descendants a Muslim community submitted to You. Show us our rites of worship and turn towards us. You are the Ever-Returning, the Most Merciful. (Surat  al-Baqara, 128) Allah chose Adam and Nuh and the family of Ibrahim and the family of 'Imran over all other beings. (Surah Al 'Imran, 33) And some of their forebears, descendants and brothers; We chose them and guided them to a straight path. (Surat al-An'am, 87)