Musnad Ahmad 2450

Translation

✧ The Messenger of Allah ﷺ never fasted a complete month other than Ramadan. And when he fasted, he would continue fasting until someone would say: 'By Allah, he will not break his fast.' And when he broke his fast, he would continue not fasting until someone would say: 'By Allah, he will not fast.'

Grades by grader

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
   عن
2. 2
   Saʿīd b. Jubayr al-Asadī

   Trustworthy (thiqah), firmly reliable (thabt), a jurist (faqīh); his narration from ʿĀʾishah, Abū Mūsā and the like is mursald. 95 AH, from al-Fallās: 94 AH
   سَعِيدِ بْنِ جُبَيْرٍثقة ثبت فقيه ، وروايته عن عائشة وأبي موسى ونحوهما مرسلة
   عن
3. 3
   Abū Bishr

   Trustworthy (thiqah), among the most reliable of people in narrating from Saʿīd b. Jubayrd. 123 AH or 124 AH or 125 AH or 126 AH, also said: 131 AH
   أَبِي بِشْرٍثقة ، من أثبت الناس في سعيد بن جبير
   عن
4. 4
   Abū ʿAwānah

   trustworthy and meticulous (thiqah thabt), from the seventh generation (ṭabaqah)d. 175, or 176 AH
   أَبُو عَوَانَةَثقة ثبت ، من السابعة
   حدثنا
5. 5
   Surayj

   trustworthy (thiqah), makes occasional mistakes (yahimu qalīlan)d. 217 AH or 229 AH
   سُرَيْجُ بْنُ النُّعْمَانِثقة يهم قليلا
   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.