Musnad Ahmad 4486

Translation

✧ The Messenger of Allah ﷺ made the charity of Ramadan obligatory on male and female, free and slave: a sa' of dates or a sa' of barley. He said: 'Afterwards, the people equated it with half a sa' of wheat.' Ayyub said: 'And Nafi' said: Ibn Umar used to give dates, except for one year when dates were scarce, so he gave barley.'

Grades by grader

Narrators

1. 1
   ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb

   One of the Companions who narrated most often, and one of the ʿAbādilah; he was among the people most strict in following the narrations (athar).d. 72 AH, or 73 AH, or 74 AH, also said: 75 AH
   عَبْدُ اللهِ بْنُ عُمَرَ بْنِ الْخَطَّابِأحد المكثرين من الصحابة والعبادلة ، وكان من أشد الناس اتباعا للأثر
   عن
2. 2
   Nāfiʿ mawlá Ibn ʿUmar

   trustworthy (thiqah), reliable (thabt), a well-known jurist (faqīh)d. 116 AH, or 117 AH, or 118 AH, or 119 AH, or 120 AH
   نَافِعٍثقة ثبت فقيه مشهور
   عن
3. 3
   Ayyūb al-Sakhtiyānī

   Trustworthy (thiqah), firmly reliable (thabt), an authority (ḥujjah), one of the leading jurists and devout worshippersd. 130 AH, or 131 AH, or 132 AH, also said: 124 AH, also said: 125 AH, also said: 129 AH
   أَيُّوبُثقة ثبت حجة ، من كبار الفقهاء العباد
   أخبرنا
4. 4
   Ismāʿīl

   trustworthy, a memorizer (thiqah ḥāfiẓ)d. 193 AH, or 194 AH
   إِسْمَاعِيلُثقة حافظ
   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.