Sahih Muslim 1133a

Translation

I went to Ibn 'Abbas (Allah be Pleased with both of them) and he was reclining using his mantle as a pillow near the fountain of Zamzam. I said to him: Tell me about fasting on Ashura. He said: When you see the new moon of Muharram then count the (days) and observe fast on the 9th. I said to him: Is it how the Messenger of Allah ﷺ observed the fast? He said: Yes.

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Other narrations of this report

Sunan Abi Dawud 2446Musnad Ahmad 2214Sahih Ibn Hibban 3633Sahih Ibn Khuzaymah 2321al-Mu'jam al-Kabir (al-Tabarani) 12960Musannaf Ibn Abi Shaybah 9471

Narrators

1. 1
   ʿAbdullāh b. ʿAbbās

   One of the Companions who narrated most prolifically (mukthirūn).d. 65 AH, or 67 AH, or 68 AH, also said: 69 AH, also said: 70 AH; also said: 73 AH
   عَبْدُ اللهِ بْنُ عَبَّاسٍأحد المكثرين من الصحابة
   أخبرني
2. 2
   al-Ḥakam b. ʿAbdullāh b. Isḥāq al-Aʿraj

   trustworthy (thiqah), though he sometimes erred (rubbamā wahima)d. between 101 and 110 AH
   الْحَكَمِ بْنِ الْأَعْرَجِثقة ، ربما وهم
   عن
3. 3
   Ḥājib b. ʿUmar

   Trustworthy (thiqah), accused of holding the opinion of the Khawārijd. 158 AH
   حَاجِبِ بْنِ عُمَرَثقة ، رمي برأي الخوارج
   عن
4. 4
   Wakīʿ b. al-Jarrāḥ

   Trustworthy, a memorizer, devout (thiqah ḥāfiẓ ʿābid)d. 196 AH, or 197 AH, or 198 AH
   وَكِيعُ بْنُ الْجَرَّاحِثقة حافظ عابد
   حدثنا
5. 5
   Abū Bakr b. Abī Shaybah

   trustworthy (thiqah), a memorizer (ḥāfiẓ), author of works (ṣāḥib taṣānīf)d. 235 AH, or 234 AH
   أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَثقة حافظ ، صاحب تصانيف
   حدثنا
6. 6
   Muslim

   Trustworthy (thiqah), a retentive memorizer (ḥāfiẓ), an imam, an author of compilations, knowledgeable in jurisprudence (fiqh)d. Muḥammad b. Yaʿqūb said: 261 AH, Makkī b. ʿAbdān said: 259 AH
   مُسْلِمٌثقة حافظ ، إمام ، مصنف ، عالم بالفقه

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

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