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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.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، عَنْ أَبِيهِ، عَنْ سَهْلِ بْنِ سَعْدٍ، قَالَ مَا عَدُّوا مِنْ مَبْعَثِ النَّبِيِّ صلى الله عليه وسلم وَلاَ مِنْ وَفَاتِهِ، مَا عَدُّوا إِلاَّ مِنْ مَقْدَمِهِ الْمَدِينَةَ‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 3934
• Sahih al-Bukhari, Vol. 5, Book of Merits of Al-Ansaar, Hadith 271
• Sahih al-Bukhari, Book of Merits of Al-Ansaar, Hadith 271