[Machine] This verse was revealed {and eat and drink until the white thread of dawn becomes distinct to you from the black thread} [Surah Al-Baqarah 187], and it did not reveal {of dawn} [Surah Al-Baqarah 187]. He said, "There were men among us who, when they wanted to fast, would tie a white thread and a black thread around one of their legs. He would continue to eat and drink until he could distinguish between the two threads. Then Allah, the Most High, revealed after that {of dawn} [Surah Al-Baqarah 187], so they knew that it only meant the night and the day." Ibn Abi Maryam said, "Ibn Abi Hazim narrated to me from his father from Sahl bin Saad in a similar manner."
نَزَلَتْ هَذِهِ الْآيَةُ {وَكُلُوا وَاشْرَبُوا حَتَّى يَتَبَيَّنَ لَكُمُ الْخَيْطُ الْأَبْيَضُ مِنَ الْخَيْطِ الْأَسْوَدِ} [البقرة 187] وَلَمْ يَنْزِلْ {مِنَ الْفَجْرِ} [البقرة 187] قَالَ وَكَانَ رِجَالٌ إِذَا أَرَادُوا الصَّوْمَ رَبَطَ أَحَدُهُمْ فِي رِجْلَيْهِ الْخَيْطَ الْأَبْيَضَ وَالْخَيْطَ الْأَسْوَدَ فَلَا يَزَالُ يَأْكُلُ وَيَشْرَبُ حَتَّى يَتَبَيَّنَ لَهُ رُؤْيَتُهُمَا فَأَنْزَلَ اللهُ تَعَالَى بَعْدَ ذَلِكَ {مِنَ الْفَجْرِ} [البقرة 187] فَعَلِمُوا أَنَّهُ إِنَّمَا يَعْنِي بِذَلِكَ اللَّيْلَ وَالنَّهَارَ قَالَ ابْنُ أَبِي مَرْيَمَ وَحَدَّثَنِي ابْنُ أَبِي حَازِمٍ عَنْ أَبِيهِ عَنْ سَهْلِ بْنِ سَعْدٍ بِنَحْوِهِ