Musnad Ahmad 21060

Translation

✧ We said to Khabbab: How did you know when the Messenger of Allah ﷺ recited in the Zuhr and Asr prayers? He said: By the quivering of his beard.

Grades by grader

Narrators

1. 1
   Khabbāb b. al-Aratt al-Tamīmī

   among the first to embrace Islam, and he was tortured for the sake of Allah, and he was present at Badrd. 37 AH, also said: 19 AH, also said: 39 AH
   خَبَّاب بْن الأَرَتّ التَّمِيمِيّمن السابقين إلى الإسلام ، وكان يعذب في الله ، وشهد بدرا
   قلنا
2. 2
   ʿAbdullāh b. Sakhbarah

   trustworthy (thiqah)d. during the governorship of ʿUbayd Allāh b. Ziyād, or 62 AH
   أَبِي مَعْمَرٍثقة
   عن
3. 3
   ʿUmārah b. ʿUmayr al-Taymī

   trustworthy, precise (thiqah thabt)d. 82 AH, or 98 AH, or 100 AH
   عُمَارَةَ بْنِ عُمَيْرٍثقة ثبت
   عن
4. 4
   al-Aʿmash

   Trustworthy (thiqah), a retentive memorizer (ḥāfiẓ), knowledgeable in the recitations (qirāʾāt), scrupulous (wariʿ), but he practiced concealment (tadlīs)d. Abū ʿAwānah said, and ʿAbd Allāh b. Dāwūd: 147 AH. Wakīʿ said, and more than one: 148 AH. And al-Khaṭīb considered it correct. Also said: 145 AH
   الْأَعْمَشُثقة حافظ , عارف بالقراءات ورع لكنه يدلس
   حدثنا
5. 5
   Wakīʿ b. al-Jarrāḥ

   Trustworthy, a memorizer, devout (thiqah ḥāfiẓ ʿābid)d. 196 AH, or 197 AH, or 198 AH
   وَكِيعٌثقة حافظ عابد
   حدثنا
6. 6
   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.