Sahih al-Bukhari 4511
Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · Hadith 38
Hadith text
Narrated Sahl bin Sa`d The Verse "And eat and drink until the white thread appears to you distinct from the black thread." was revealed, but: '... of dawn' was not revealed (along with it). So some men, when intending to fast, used to tie their legs, one with white thread and the other with black thread and would keep on eating till they could distinguish one thread from the other. Then Allah revealed' ... of dawn,' whereupon they understood that meant the night and the day
Sahl bin Sa'd bataate hain: Ye Aayat naazil hui, 'Aur khaao piyo yahaan tak ke safed dhaaga kaale dhaage se saaf zaahir ho jaaye,' magar '...subah ka' (ye alfaaz) us waqt naazil nahi hue the. To kuch log jab roza rakhna chahte, apne pairon mein ek taraf safed dhaaga aur doosri taraf kaala dhaaga baandh lete aur khaate rehte jab tak ek ko doosre se pehchaan na paate. Phir Allah ne '...subah ka' naazil kiya, isse unhe samajh aaya ke iska matlab raat aur din hai.
Sahih al-Bukhari 4511 · Book 65, Hadith 38
Read all hadith in Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))