Narrated Sahl bin Sad: The Prophet's companions did not take as a starting date for the Muslim calendar, the day, the Prophet had been sent as an Apostle or the day of his death, but the day of his arrival at Medina.
— Sahih Bukhari, Volume 5, Book 58: Merits of the Helpers in Madinah (Ansaar), Hadith #271
Narrated Sahl bin Sad: The Prophet's companions did not take as a starting date for the Muslim calendar, the day, the Prophet had been sent as an Apostle or the day of his death, but the day of his arrival at Medina.
This hadith is from the book of Merits of the Helpers in Madinah (Ansaar) in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 271 in book 58 of volume 5.
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