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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:8035 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū Bakr Aḥmad b. Salmān al-Faqīh > ʿAbd al-Malik b. Muḥammad al-Raqāshī > Abū ʿĀṣim > Yazīd b. Abū ʿUbayd > Salamah b. al-Akwaʿ

[Machine] The Messenger of Allah ﷺ sent a man from among the Muslims to his people on the day of Ashura and said: "Command them to observe fasting on this day." The man replied: "O Messenger of Allah, I fear that they will not adhere to it until they eat." He ﷺ said: "Whoever among them eats, let him fast the rest of the day."  

البيهقي:٨٠٣٥ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنبأ أَبُو بَكْرٍ أَحْمَدُ بْنُ سَلْمَانَ الْفَقِيهُ ثنا عَبْدُ الْمَلِكِ بْنُ مُحَمَّدٍ الرَّقَاشِيُّ ثنا أَبُو عَاصِمٍ ثنا يَزِيدُ بْنُ أَبِي عُبَيْدٍ عَنْ سَلَمَةَ بْنِ الْأَكْوَعِ

أَنَّ رَسُولَ اللهِ ﷺ بَعَثَ رَجُلًا مِنْ أَسْلَمَ إِلَى قَوْمِهِ يَوْمَ عَاشُورَاءَ فَقَالَ مُرْهُمْ فَلْيَصُومُوا هَذَا الْيَوْمَ فَقَالَ يَا رَسُولَ اللهِ مَا أَرَانِي آتِيهِمْ حَتَّى يَطْعَمُوا قَالَ مَنْ طَعِمَ مِنْهُمْ فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ  

رَوَاهُ الْبُخَارِيُّ فِي الصَّحِيحِ عَنْ أَبِي عَاصِمٍ وَأَخْرَجَهُ مُسْلِمٌ مِنْ وَجْهٍ آخَرَ عَنْ يَزِيدَ وَقَدْ رُوِيَ فِي الْحَدِيثِ أَنَّهُ أَمَرَ بِالْقَضَاءِ وَذَلِكَ فِيمَا

See similar narrations below:

Collected by Bayhaqī
bayhaqi:8407 – [Chain 1] Abū ʿAbdullāh Muḥammad b. Aḥmad b. Abū Ṭāhir al-Daqqāq> ʿAlī b. Muḥammad b. Sulaymān al-Ḥarbī > Abū Qilābah [Chain 2] Abū ʿAbdullāh al-Ḥāfiẓ > Abū Bakr Aḥmad b. Salmān al-Faqīh > ʿAbd al-Malik b. Muḥammad al-Raqāshī > Makkī b. Ibrāhīm > Yazīd b. Abū ʿUbayd > Salamah b. al-Akwaʿ

[Machine] The Prophet ﷺ sent a man who had converted to Islam on the day of Ashura to his people, ordering them to fast on this day. The man said, "I do not think I will come to them until they have eaten." The Prophet ﷺ said, "Whoever among them eats, let him fast the rest of the day."  

البيهقي:٨٤٠٧ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ أَبِي طَاهِرٍ الدَّقَّاقُ بِبَغْدَادَ أنبأ عَلِيُّ بْنُ مُحَمَّدِ بْنِ سُلَيْمَانَ الْحَرْبِيُّ ثنا أَبُو قِلَابَةَ ح وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَاللَّفْظُ لَهُ أنبأ أَبُو بَكْرٍ أَحْمَدُ بْنُ سَلْمَانَ الْفَقِيهُ ثنا عَبْدُ الْمَلِكِ بْنُ مُحَمَّدٍ الرَّقَاشِيُّ ثنا مَكِّيُّ بْنُ إِبْرَاهِيمَ ثنا يَزِيدُ بْنُ أَبِي عُبَيْدٍ عَنْ سَلَمَةَ بْنِ الْأَكْوَعِ

أَنَّ النَّبِيَّ ﷺ بَعَثَ رَجُلًا مِنْ أَسْلَمَ يَوْمَ عَاشُورَاءَ إِلَى قَوْمِهِ يَأْمُرُهُمْ فَلْيَصُومُوا هَذَا الْيَوْمَ فَقَالَ مَا أَرَى آتِيَهُمْ حَتَّى يَطْعَمُوا قَالَ مَنْ طَعِمَ مِنْهُمْ فَلْيَصُمْ بَقِيَّةَ يَوْمِهِ  

رَوَاهُ الْبُخَارِيُّ فِي الصَّحِيحِ عَنْ مَكِّيِّ بْنِ إِبْرَاهِيمَ وَأَخْرَجَهُ مُسْلِمٌ مِنْ حَدِيثِ حَاتِمِ بْنِ إِسْمَاعِيلَ عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ