Anas bin Malik reported,
When Abu Bakr 
was appointed caliph, he sent him to Bahrain and wrote this letter for him, sealing it with the seal of the Prophet ﷺ. The engraving on the seal consisted of three lines, Muhammad on one line, Messenger on another line, and Allah on the third line.
Bukhari 3106
Sahihحدثنا محمد بن عبد الله الأنصاري قال حدثني أبي عن ثمامة
عن أنس
أن أبا بكر رضي الله عنه لما استخلف بعثه إلى البحرين وكتب له هذا الكتاب وختمه بخاتم النبي ﷺ وكان نقش الخاتم ثلاثة أسطر محمد سطر ورسول سطر والله سطر
البخاري 3106صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Obligation of the fifth
Chapter
Armor of the Prophet ﷺ, his staff, sword, cup, and ring, and what the caliphs used after him of those items whose division was not mentioned, and his hair, sandals, and vessels, from which his companions and others sought blessings after his death
Numbering
Darussalam 3106
Details
Collection
Sahih Bukhari
Book
Obligation of the fifth
Chapter
Armor of the Prophet ﷺ, his staff, sword, cup, and ring, and what the caliphs used after him of those items whose division was not mentioned, and his hair, sandals, and vessels, from which his companions and others sought blessings after his death
Numbering
Darussalam 3106
Ayat
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