Sahih Bukhari, Volume 4, Book53, Number 338

Narrated Anas:
That when Abu Bakr became the Caliph, he sent him to Bahrain and wrote this letter for him, and¬†stamped it with the Ring of the Prophet. Three lines were engraved on the Ring, (the word)¬†’Muhammad’ was in a line, ‘Apostle’ was in another line, and ‘Allah’ in a third.
Sahih Bukhari, Volume 4, Book53, Number 338

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