Sayyiduna ‘Adi bin Hatim (may Allah be pleased with him) narrates that when this verse «‏‏‏‏وَكُلُوا وَاشْرَبُوا حَتَّىٰ يَتَبَيَّنَ لَكُمُ الْخَيْطُ الْأَبْيَضُ مِنَ الْخَيْطِ الْأَسْوَدِ» ‏‏‏‏ [ سورة البقرة: 187 ] “And eat and drink until the white thread of dawn becomes distinct to you from the black thread,”was revealed, the Messenger of Allah (peace and blessings be upon him) said:“Indeed, it is the distinction of the whiteness of the day from the darkness of the night.”