English translation
7162. Narrated Anas bin Mālik رضي الله عنه: When the Prophet ﷺ intended to write to the (rulers of) Byzantines, the people said, “They do not read a letter unless it is sealed (stamped).” Therefore the Prophet ﷺ took a silver ring, as if I am looking at its glitter now and its engraving was: Muḥammad, Messenger of Allāh.
