People of the Book or Ahl al-kitāb is an Islamic term referring to followers of those religions which Muslims regard as having been guided by previous revelations, generally in the form of a scripture. In the Quran they are identified as the Jews, the Christians, the Sabians, and—according to some interpretations—the Zoroastrians. Starting from the 8th century, some Muslims also recognized other religious groups such as the Samaritans, and even Buddhists, Hindus, and Jains, as People of the Book.

Mandaeans, also known as Mandaean Sabians or simply as Sabians, are an ethnoreligious group who are followers of Mandaeism. They believe that John the Baptist was the final and most important prophet. They may have been among the earliest religious groups to practice baptism, as well as among the earliest adherents of Gnosticism, a belief system of which they are the last surviving representatives today. The Mandaeans were originally native speakers of Mandaic, an Eastern Aramaic language, before they nearly all switched to Mesopotamian Arabic or Persian as their main language.