Anas bin Malik (r) narrates…

“Once the Prophet (peace be upon him) wrote a letter or had an idea of writing a letter. The Prophet was told that they (rulers) would not read letters unless they were sealed. So the Prophet got a silver ring made with “Muhammad Allah’s Messenger” engraved on it. As if I were just observing its white glitter in the hand of the Prophet (s).”

(Bukhari Vol. 1, Book 3, Hadith 65)

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