It indicates purity and simplicity, and comes from an ancient text that reads: "If you are pure and true and without desires, nothing can change you." This term is one that derives directly from the Muslim lifestyle.
傳到中國且逐漸漢化後，中國人將伊斯蘭譯作清真，意指純潔樸素，取自世說新語：「清真寡慾，萬物不能移也。」