Sahih Muslim
Sahih Muslim 1091 b
Book 13: The Book of Fasting
Sahl b. Sa’d (Allah be pleased with him) said: When this verse was revealed.” Eat and drink till the white streak becomes distinct from the dark streak for you,” the person who decided to observe fast tied on one of his feet a black thread and on the other a white thread. And he went on eating and drinking till he could distinguish (between their colour) on seeing them. It was after this that Allah reveal- ed (the words): min al-fajr. And they (the Muslims) came to know that (the word khait) refers to the night and day.
حَدَّثَنِي مُحَمَّدُ بْنُ سَهْلٍ التَّمِيمِيُّ، وَأَبُو بَكْرِ بْنُ إِسْحَاقَ قَالاَ حَدَّثَنَا ابْنُ أَبِي مَرْيَمَ، أَخْبَرَنَا أَبُو غَسَّانَ، حَدَّثَنِي أَبُو حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ، – رضى الله عنه – قَالَ لَمَّا نَزَلَتْ هَذِهِ الآيَةُ [quran sura=”2″ aya_start=”187″ aya_end=”187″]{ وَكُلُوا وَاشْرَبُوا حَتَّى يَتَبَيَّنَ لَكُمُ الْخَيْطُ الأَبْيَضُ مِنَ الْخَيْطِ الأَسْوَدِ} قَالَ فَكَانَ الرَّجُلُ إِذَا أَرَادَ الصَّوْمَ رَبَطَ أَحَدُهُمْ فِي رِجْلَيْهِ الْخَيْطَ الأَسْوَدَ وَالْخَيْطَ الأَبْيَضَ فَلاَ يَزَالُ يَأْكُلُ وَيَشْرَبُ حَتَّى يَتَبَيَّنَ لَهُ رِئْيُهُمَا فَأَنْزَلَ اللَّهُ بَعْدَ ذَلِكَ [quran sura=”2″ aya_start=”187″ aya_end=”187″]{ مِنَ الْفَجْرِ} فَعَلِمُوا أَنَّمَا يَعْنِي بِذَلِكَ اللَّيْلَ وَالنَّهَارَ .
More hadith from this chapter
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Hadith text, translations and grading are courtesy of Sunnah.com.