وَ رَوَى أَبُو بَصِيرٍ عَنْ أَحَدِهِمَا عَلَيْهِمَا اَلسَّلاَمُ: فِي قَوْلِ اَللَّهِ عَزَّ وَ جَلَّ « وَ كُلُوا وَ اِشْرَبُوا حَتّٰى يَتَبَيَّنَ لَكُمُ اَلْخَيْطُ اَلْأَبْيَضُ مِنَ اَلْخَيْطِ اَلْأَسْوَدِ مِنَ اَلْفَجْرِ » فَقَالَ «نَزَلَتْ فِي خَوَّاتِ بْنِ جُبَيْرٍ اَلْأَنْصَارِيِّ وَ كَانَ مَعَ اَلنَّبِيِّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ فِي اَلْخَنْدَقِ وَ هُوَ صَائِمٌ وَ أَمْسَى عَلَى تِلْكَ اَلْحَالِ وَ كَانُوا قَبْلَ أَنْ تَنْزِلَ هَذِهِ اَلْآيَةُ إِذَا نَامَ أَحَدُهُمْ حَرُمَ عَلَيْهِ اَلطَّعَامُ فَجَاءَ خَوَّاتٌ إِلَى أَهْلِهِ حِينَ أَمْسَى فَقَالَ عِنْدَكُمْ طَعَامٌ فَقَالُوا لاَ تَنَمْ حَتَّى نَصْنَعَ لَكَ طَعَاماً فَاتَّكَى فَنَامَ قَالُوا قَدْ فَعَلْتَ قَالَ نَعَمْ فَبَاتَ عَلَى تِلْكَ اَلْحَالِ وَ أَصْبَحَ ثُمَّ غَدَا إِلَى اَلْخَنْدَقِ فَجَعَلَ يُغْشَى عَلَيْهِ فَمَرَّ بِهِ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ فَلَمَّا رَأَى اَلَّذِي بِهِ أَخْبَرَهُ كَيْفَ كَانَ أَمْرُهُ فَأَنْزَلَ اَللَّهُ عَزَّ وَ جَلَّ: «وَ كُلُوا وَ اِشْرَبُوا حَتّٰى يَتَبَيَّنَ لَكُمُ اَلْخَيْطُ اَلْأَبْيَضُ مِنَ اَلْخَيْطِ اَلْأَسْوَدِ مِنَ اَلْفَجْرِ» ».
Abu Basir narrated from one of the Imams (a.s) regarding the verse of Allah (swt), the Exalted: "And eat and drink until the white thread becomes distinct to you from the black thread of dawn" (Surah Al-Baqarah 2:187). Imam (a.s) said: "This verse was revealed about Khawwat ibn Jubayr al-Ansari. He was with the Prophet (peace be upon him and his family) during the Battle of the Trench while fasting. Before this verse was revealed, if anyone slept at night, food became forbidden for them. Khawwat came to his family at night and asked: 'Do you have any food?' They said: 'Do not sleep until we prepare food for you.' He reclined and fell asleep. When they told him: 'You have already slept,' he replied, 'Yes, I did.' He remained in that state, fasting until the next day, and went to the trench, where he started to faint. The Messenger of Allah (swt) (peace be upon him and his family) passed by him, and when he saw his condition, he asked about his situation. Khawwat then explained what had happened. Then Allah (swt), the Exalted, revealed: 'And eat and drink until the white thread becomes distinct to you from the black thread of dawn.'" (Surah Al-Baqarah 2:187).