Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:5910Yaḥyá b. Ayyūb al-ʿAllāf > Saʿīd b. Abū Maryam And Yaḥyá b. Bukayr > Ibn Abū Ḥāzim > Abū Ḥāzim > Sahl b. Saʿd

[Machine] The people have not encountered any harm in terms of the number that they counted from the time of the Prophet's ﷺ mission, nor from his death. They have only encountered harm from the beginning of the city.  

الطبراني:٥٩١٠حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ الْعَلَّافُ ثنا سَعِيدُ بْنُ أَبِي مَرْيَمَ وَيَحْيَى بْنُ بُكَيْرٍ قَالَا ثنا ابْنُ أَبِي حَازِمٍ حَدَّثَنِي أَبُو حَازِمٍ عَنْ سَهْلِ بْنِ سَعْدٍ قَالَ

«مَا أَصَابَ النَّاسُ الْعَدَدَ مَا عَدُّوا مِنْ مَبْعَثِ رَسُولِ اللهِ ﷺ وَلَا مِنْ وَفَاتِهِ وَلَا عَدُّوا إِلَّا مِنْ مَقْدِمِهِ الْمَدِينَةَ»  


See similar narrations below:

Collected by Bukhārī, Ḥākim
bukhari:3934ʿAbdullāh b. Maslamah > ʿAbd al-ʿAzīz from his father > Sahl b. Saʿd

The Prophet's companions did not take as a starting date for the Muslim calendar, the day, the Prophet ﷺ had been sent as an Apostle or the day of his death, but the day of his arrival at Medina.  

البخاري:٣٩٣٤حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ حَدَّثَنَا عَبْدُ الْعَزِيزِ عَنْ أَبِيهِ عَنْ سَهْلِ بْنِ سَعْدٍ قَالَ

مَا عَدُّوا مِنْ مَبْعَثِ النَّبِيِّ ﷺ وَلاَ مِنْ وَفَاتِهِ مَا عَدُّوا إِلاَّ مِنْ مَقْدَمِهِ الْمَدِينَةَ  

hakim:4285Abū al-Ḥasan Muḥammad b. Aḥmad al-Khayyāṭ> ʿUbayd b. Sharīk al-Bazzāz > Abū Maʿmar > ʿAbd al-ʿAzīz b. Abū Ḥāzim > Abīh Sahl b. Saʿd

[Machine] "People made a mistake in counting, not in his allegiance or his death, but rather in counting from the beginning of the city."  

الحاكم:٤٢٨٥حَدَّثَنَا أَبُو الْحَسَنِ مُحَمَّدُ بْنُ أَحْمَدَ الْخَيَّاطُ بِبَغْدَادَ ثنا عُبَيْدُ بْنُ شَرِيكٍ الْبَزَّازُ ثنا أَبُو مَعْمَرٍ ثنا عَبْدُ الْعَزِيزِ بْنُ أَبِي حَازِمٍ عَنْ أَبِيهِ سَهْلِ بْنِ سَعْدٍ قَالَ

«أَخْطَأَ النَّاسُ فِي الْعَدَدِ مَا عَدُّوا مِنْ بَيْعَتِهِ وَلَا مِنْ وَفَاتِهِ إِنَّمَا عَدُّوا مِنْ مَقْدَمِهِ الْمَدِينَةَ»  

هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخَرِّجَاهُ على شرط البخاري ومسلم