\nNarrated Sahl bin Saud:\n \n\nWhen the following verses were revealed: 'Eat and drink until the white thread appears to you, distinct \nfrom the black thread' and of dawn was not revealed, some people who intended to fast, tied black and \nwhite threads to their legs and went on eating till they differentiated between the two. Allah then \nrevealed the words, 'of dawn', and it became clear that meant night and day.\n

\nNarrated Sahl bin Saud:\n \n\nWhen the following verses were revealed: 'Eat and drink until the white thread appears to you, distinct \nfrom the black thread' and of dawn was not revealed, some people who intended to fast, tied black and \nwhite threads to their legs and went on eating till they differentiated between the two. Allah then \nrevealed the words, 'of dawn', and it became clear that meant night and day.\n

\nحَدَّثَنَا سَعِيدُ بْنُ أَبِي مَرْيَمَ، حَدَّثَنَا ابْنُ أَبِي حَازِمٍ، عَنْ أَبِيهِ، عَنْ سَهْلِ بْنِ سَعْدٍ، ح‏.‏ حَدَّثَنِي سَعِيدُ بْنُ أَبِي مَرْيَمَ، حَدَّثَنَا أَبُو غَسَّانَ، مُحَمَّدُ بْنُ مُطَرِّفٍ قَالَ حَدَّثَنِي أَبُو حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ، قَالَ أُنْزِلَتْ ‏{‏وَكُلُوا وَاشْرَبُوا حَتَّى يَتَبَيَّنَ لَكُمُ الْخَيْطُ الأَبْيَضُ مِنَ الْخَيْطِ الأَسْوَدِ‏}‏ وَلَمْ يَنْزِلْ مِنَ الْفَجْرِ، فَكَانَ رِجَالٌ إِذَا أَرَادُوا الصَّوْمَ رَبَطَ أَحَدُهُمْ فِي رِجْلِهِ الْخَيْطَ الأَبْيَضَ وَالْخَيْطَ الأَسْوَدَ، وَلَمْ يَزَلْ يَأْكُلُ حَتَّى يَتَبَيَّنَ لَهُ رُؤْيَتُهُمَا، فَأَنْزَلَ اللَّهُ بَعْدُ ‏{‏مِنَ الْفَجْرِ‏}‏ فَعَلِمُوا أَنَّهُ إِنَّمَا يَعْنِي اللَّيْلَ وَالنَّهَارَ‏.‏