The Sufficient (Vol 4) · Hadith 361 (#Ḥadīth #5)

5ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ قَالَ سَأَلْتُهُ عَنْ صَوْمِ الدَّهْرِ فَكَرِهَهُ وَقَالَ لا بَأْسَ أَنْ يَصُومَ يَوْماً وَيُفْطِرَ يَوْماً.

5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah, who has said the following: “I once asked him (the Imam) , about fasting forever. He (the Imam) disliked it and said, ‘It is not harmful to fast one day and not to fast the next day.’”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).