Ahl al-Bayt (Arabic: أهل البيت‎) is an Arabic phrase literally meaning People of the House, or family of the House. The phrase "ahl al-bayt" was used in Arabia before the advent of Islam to refer to one's clan, and would be adopted by the ruling family of a tribe. Within the Islamic tradition, the term refers to the family of the Islamic prophet Muhammad. The Ahl al-Bayt are particularly important to Shia Muslims because Shias generally derive their hadiths from the Ahl-al-Bayt and their close associates.

In Shia Islam, the Ahl al-Bayt are central to Islam and interpreters of the Quran and sunnah. Shias believe they are successors of Muhammad and consist of Muhammad, Fatimah, Ali, Hasan and Husayn (known collectively as the Ahl al-Kisa, "people of the mantle") and the imams. There are differing opinions on the scope and importance of Ahl al-Bayt.

In Sunni Islam, Muhammad's household includes his wives, his daughter, Fatimah, his cousin and son-in-law, Ali and their two children, Hasan ibn Ali and Husayn ibn Ali. Other Sunni include all Muhammad's descendants and sometimes the descendants of his paternal uncle, ‘Abbas ibn ‘Abd al-Muttalib, the founders of the Abbasid Caliphate. In Sunni and Shia thought, every Muslim has the obligation to love the Ahl al-Bayt.

Hamza Yusuf Hanson is an American Islamic scholar, and (with Zaid Shakir and Hatem Bazian) is co-founder of Zaytuna College in Berkeley, California, United States. He is a convert to Islam, and is one of the signatories of A Common Word Between Us and You, an open letter by Islamic scholars to Christian leaders, calling for peace and understanding. He has described the 9/11 attacks as "an act of 'mass murder, pure and simple'". Condemning the attacks, he has also stated "Islam was hijacked ... on that plane as an innocent victim".The Guardian newspaper in the United Kingdom reported that he "is arguably the west's most influential Islamic scholar" and added that "many Muslims find his views hard to stomach."

Hamza Yusuf was born to two academics in Washington State and raised in Northern California. In 1977, he became Muslim and subsequently traveled to the Muslim world and studied for ten years in the United Arab Emirates, Saudi Arabia, as well as North and West Africa. Hamza Yusuf spent four years studying in the United Arab Emirates and elsewhere in the Middle East. Later he traveled to West Africa and studied in Mauritania, Medina, Algeria, and Morocco under such scholars as Murabit al Haaj; Baya bin Salik, head of the Islamic court in Al-'Ain, United Arab Emirates; Muhammad Shaybani, Mufti of Abu Dhabi; Hamad al-Wali; and Muhammad al-Fatrati of Al Azhar University in Cairo, Egypt.^{[citation needed]} After more than a decade abroad, he returned to the United States and earned degrees in nursing from Imperial Valley College and religious studies at San José State University.^{[citation needed]}