A ḥadīth (Arabic: حديث‎,  /ˈhædɪθ/ or /hɑːˈdiːθ/) (plural: hadith, hadiths, or aḥādīth) is a saying or an act or tacit approval or disapproval ascribed either validly or invalidly to the Islamic prophet Muhammad.

Hadith are regarded by traditional Islamic schools of jurisprudence as important tools for understanding the Quran and in matters of jurisprudence. Hadith were evaluated and gathered into large collections during the 8th and 9th centuries. These works are referred to in matters of Islamic law and history to this day. The two largest denominations of Islam, Shiʻism and Sunnism, have different sets of hadith collections.

In Arabic the word ḥadīth (Arabic: حديث‎ ḥadīṯ  IPA: [ħaˈdiːθ]) means 'a piece of information conveyed either in a small quantity or large'. The Arabic plural is أحاديث ʾaḥādīṯ/aḥādīth (IPA: [ʔaħaːˈdiːθ]). Hadith also refers to the speech of a person. As taḥdīṯ/taḥdīth is the infinitive, or verbal noun, of the original verb form; hadith is, therefore, not the infinitive, rather it is a noun.

Yusuf Estes (born in 1944) is an American Muslim preacher and teacher who converted from Christianity to Islam in 1991. He was a Muslim Chaplain for the United States Bureau of Prisons through the 1990s. He was a Muslim Delegate to the United Nations World Peace Conference for Religious Leaders held at the U.N. in September 2000.

Active in Islamic missionary work in the United States, Estes is often featured as guest presenter and keynote speaker at various Islamic events as well as frequently appearing on various Islamic satellite TV channels. Estes takes a dim view of today's public school system in the United States for any children, and highly recommends schools where they might receive a religious education combined with more advanced scholastic education.

Yusuf Estes was born in Ohio, and was raised in Houston, Texas in a Anglo-Saxon Protestant family. From 1962 to 1990, his career was in the music, entertainment and marketing fields. He also taught music and served as a music minister. He owned several musical instrument companies including the Estes Piano and Organ Company. He produced and directed live entertainment programs in the United States from the mid 1960s until his last endeavor for cable TV in Florida, entitled 'Estes Music Jamboree'.

Suhaib Webb is a contemporary American-Muslim educator, activist, and lecturer. He is currently the imam of the Islamic Society of Boston Cultural Center (ISBCC), the largest mosque in the New England area.

He was born William Webb in 1972 in Oklahoma to a Christian family, including a grandfather who served as a preacher. At age 14, he lost interest in religion going through a self-described spiritual crisis. He also began engaging in delinquency by joining a local gang, was involved in a drive by shooting, and became a successful local Hip-Hop DJ and producer, making records with various artists.

After converting to Islam in 1992, Webb left his career as a DJ and studied at the University of Central Oklahoma, where he graduated with a Bachelor's degree in Education. He also studied privately under a Senegalese Sheikh, learning enough Islam and Arabic to become a community leader in Oklahoma City, where he was hired as Imam at The Islamic Society of Greater Oklahoma City. He simultaneously started teaching at Mercy School, an Islamic K-12 school in Oklahoma City.

Abu Usamah at-Thahabi (born March 10, 1964) is an Imam at Green Lane Masjid in Birmingham, England.

Abu Usamah, Khalifah At-Thahabi, born Frankie Lipscomb, was born and raised in Passaic, New Jersey, the third eldest of four children. His siblings names include Kimberly, Sylvia, and also Daryl.

He reverted to Islam in 1986, and applied to attend the University of Madinah in Saudi Arabia, an Islamic school popular with reverts and international students. He attended the university for eight years where he graduated from the College of Da'wah and Usool-ad-Din. There he completed his BSc in Usool-Ul-Deen(theology) and learned the Arabic language. After his graduation from the University, Abu Usamah went to teach in the UK before returning to the US in 1996 in order to pursue his first position of Imam in Orlando, Florida. He was an imam at mosques in Philadelphia, Cleveland, and Peoria. Abu Usamah is very engaged in the Islamic community. He has also be immensely active in the giving of da'wah within the Islamic community.