Sayyiduna ‘Adi bin Hatim (may Allah be pleased with him) narrates that when this verse was revealed: {وَکُلُوْاوَاشْرَبُوْاحَتّٰییَتَبَیَّنَلَکُمُالْخَیْطُالْاَبْیَضُمِنَالْخَیْطِالْاَسْوَدِمِنَالْفَجْرِ} … And eat and drink until the white thread becomes distinct to you from the black thread of dawn (Surah Al-Baqarah: 187), I, ‘Adi, took two threads, one black and the other white, and placed them under my pillow. Then I began to look at them, but neither the black thread nor the white thread became distinct to me. When morning came, I went to the Noble Prophet (peace and blessings be upon him) and told him what I had done. The Prophet (peace and blessings be upon him) said: "Your pillow is indeed very wide! What is meant is the whiteness of the day and the darkness of the night."
Hadith Referenceالفتح الربانی / أبواب تفسير القرآن وفضائل السور والآيات حسب ترتيب النزول / 8499
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«أخرجه البخاري: 4509، 4510، ومسلم: 1090 ، (انظر مسند أحمد ترقيم الرسالة: 19370 ترقیم بيت الأفكار الدولية: 19587»
It is also narrated from Sayyiduna ‘Adi (may Allah be pleased with him), he says: The Noble Prophet (peace and blessings be upon him) taught me about prayer and fasting, and he (peace and blessings be upon him) said: At such-and-such time, perform such-and-such prayer and keep the fast; when the sun sets, then eat and drink, until the white thread becomes distinct from the black thread, and keep fasts for thirty days, unless the moon is sighted earlier. I took two threads, one black and one white, and began to look at them, but they did not become distinct for me. When I mentioned this to the Noble Prophet (peace and blessings be upon him), he smiled and said: O Ibn Hatim! By this is meant the whiteness of the day and the darkness of the night.
Hadith Referenceالفتح الربانی / أبواب تفسير القرآن وفضائل السور والآيات حسب ترتيب النزول / 8500
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«حديث صحيح ۔ أخرجه الترمذي: 2970، 2971، (انظر مسند أحمد ترقيم الرسالة: 19375 ترقیم بيت الأفكار الدولية: 19593»