The Sufficient (Vol 4) · Hadith 646 (#Ḥadīth #2)
Chapter 73 | People’s Obligation after Having Proof of the New Moon on the Day of ‘Id after Completion of Fasting
2ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ رَفَعَهُ قَالَ إِذَا أَصْبَحَ النَّاسُ صِيَاماً وَلَمْ يَرَوُا الْهِلالَ وَجَاءَ قَوْمٌ عُدُولٌ يَشْهَدُونَ عَلَى الرُّؤْيَةِ فَلْيُفْطِرُوا وَلْيَخْرُجُوا مِنَ الْغَدِ أَوَّلَ النَّهَارِ إِلَى عِيدِهِمْ.
2. Muhammad ibn Yahya has narrated from Muhammad ibn Ahmad in a marfu‘ manner who has said the following: “He (the Imam) , has said, ‘If people are fasting and have not seen the new moon, then a just people come and testify to their seeing the new moon they must discontinue fasting and on the morning of the next day come out for their ‘Id.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).