The Sabians (Arabic: صابئة) of Middle Eastern tradition were a monotheistic Abrahamic religious group mentioned three times in the Quran with the people of the Book, "the Jews, the Sabians, and the Christians." In the hadith, they are described merely as converts to Islam, but interest in the identity and history of the group increased over time, and discussions and investigations about the Sabians begin to appear in later Islamic literature.
Read more about Sabians: In The Quran, In Later Islamic Sources, Etymology, Overview, Islamic Reference, Modern Critical Scholarship