Musnad Ahmad 19451

Translation

✧ The Messenger of Allah ﷺ came out to us on the day of ʿĀshūrāʾ and said: Have you fasted this day of yours? Some of them said: Yes, and some of them said: No. He said: Then complete the rest of this day of yours. And he ordered them to inform the people of the outlying regions to complete that day of theirs.

Grades by grader

Narrators

1. 1
   Muḥammad b. Ṣayfī b. Sahl al-Khaṭmī

   Companion (ṣaḥābī)
   مُحَمَّد بْن صَيْفِيّ بْن سَهْل الخَطْمِيّصحابي
   عن
2. 2
   al-Shaʿbī

   Trustworthy (thiqah), well-known, a virtuous jurist (faqīh fāḍil)d. 103 AH, said by al-Haytham b. ʿAdī, and Yaḥyā b. Bukayr, Yaḥyā b. Maʿīn, 104 AH, said by Yaḥyā b. Maʿīn, and Ismāʿīl b. Mujālid, and Abū Nuʿaym, and Muḥammad b. ʿImrān al-Bajalī, and ʿUmar b. Shabīb al-Muslī, and ʿAbd Allāh b. Idrīs, 105 AH, said by Isḥāq b. Yaḥyā, Muḥammad b. ʿAbd Allāh b. Numayr, or: 106 AH, said by ʿAlī b. al-Madīnī, and ʿAmr b. ʿAlī, 107 AH, said by ʿAlī b. al-Madīnī, or: 109 AH, said by Ibn Ḥibbān, 110 AH, said by ʿAlī b. ʿAbd Allāh al-Tamīmī
   الشَّعْبِيِّثقة ، مشهور ، فقيه فاضل
   عن
3. 3
   Ḥuṣayn

   trustworthy (thiqah), his memory changed at the endd. 136 AH, or 139 AH
   حُصَيْنٌثقة ، تغير حفظه في الآخر
   أخبرنا
4. 4
   Hushaym b. Bashīr

   Trustworthy (thiqah), firmly reliable (thabt), who often practiced tadlīs and hidden irsāl.d. 181 AH, or 183 AH
   هُشَيْمٌثقة ثبت كثير التدليس والإرسال الخفي
   حدثنا
5. 5
   Aḥmad b. Ḥanbal

   Trustworthy (thiqah), a memorizer (ḥāfiẓ), a jurist (faqīh), an authority (ḥujjah).d. 241 AH, Abū Umayyah Muḥammad b. Ibrāhīm al-Ṭarsūsī said: 242 AH, and no one followed him in his view
   أحمد بن حنبلثقة حافظ فقيه حجة

Who each narrator was and how reliable, from hdith.com

Latin names and English verdicts with a dotted underline are machine translations, not reviewed.