Al-Kāfi - The Book of Fasting

Chapter: The Case of One Who Eats or Drinks but Has Doubts About Its Taking Place before or after Dawn َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َانَ بْنِ عِيسَى عَنْ سَ٠ِهْرَانَ قَالَ سَأَلْتُهُ عَنْ رَجُلٍ أَكَلَ وَشَرِبَ بَعْدَ ٠َا طَلَعَ الْفَجْرُ فِي شَهْرِ رَ٠َضَانَ فَقَالَ إِنْ كَانَ قَا٠ْ يَرَ الْفَجْرَ فَأَكَلَ ثُ٠َّ عَادَ فَرَأَى الْفَجْرَ فَلْيُتِ٠َهُ وَلا إِعَادَةَ عَلَيْهِ وَإِنْ كَانَ قَا٠َ فَأَكَلَ وَشَرِبَ ثُ٠َّ نَظَرَ إِلَى الْفَجْرِ فَرَأَى أَنَّهُ قَدْ طَلَعَ الْفَجْرُ فَلْيُتِ٠َهُ وَيَقْضِي يَوْ٠اً آخَرَ لأَنَّهُ بَدَأَ بِالأَكْلِ قَبْلَ النَّظَرِ فَعَلَيْهِ الإِعَادَةُ.

If he gets up, eats and drinks, and then looks to the dawn that is already there, he is required to complete that fast and make Qada’ (compensatory fast) for one other day because he ate first, then went to find out about dawn, thus fast of one day is necessary.’” وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/263))