The Sufficient (Vol 4) · Hadith 474 (#Ḥadīth #3)
Chapter 42 | The Case of One Who Wakes up in the Morning with an Intention to Fast, but Who Does Not Do So or Vice Versa when Fasting Is a Compensatory Fast for the Missed Fast in the Month of Ramadan or Other Days
3ـ أَحْمَدُ بْنُ مُحَمَّدٍ عَنِ الْعَبَّاسِ بْنِ مَعْرُوفٍ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنِ ابْنِ سِنَانٍ عَنْ عَمَّارِ بْنِ مَرْوَانَ عَنْ سَمَاعَةَ بْنِ مِهْرَانَ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) فِي قَوْلِهِ الصَّائِمُ بِالْخِيَارِ إِلَى زَوَالِ الشَّمْسِ قَالَ ذَلِكَ فِي الْفَرِيضَةِ فَأَمَّا النَّافِلَةُ فَلَهُ أَنْ يُفْطِرَ أَيَّ سَاعَةٍ شَاءَ إِلَى غُرُوبِ الشَّمْسِ.
3. Ahmad ibn Muhammad from has narrated from al-‘Abbas ibn Ma‘ruf from Safwan ibn Yahya from ibn Sinan from ‘Ammar ibn Marwan from Sama‘ah ibn Mehran, from abu ‘Abdillah regarding his saying, ‘A fasting person has the choice until Zawal (declining of the sun toward the west at noontime)’. He said: ‘It is about the obligatory (fast). In the case of the optional (fast), one has the choice to stop fasting any time up to sunset.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).