The duty of Nafs-e-Zakiyyah is mentioned in a hadith that was narrated by Abu-Basir from Muhammad al-Baqir. According to the hadith, when Muhammad al-Mahdi realizes, the people of Mecca won't accept his reappearance. Therefore, he will send Nafs-e-Zakiyyah as an envoy to convey his oral message to people of Mecca.[4][5]