The Messenger of Allah ﷺ was the source of knowledge for his Companions(may Allah be pleased with them); whenever they were confused regarding any of the laws of Islam or the meaning of any ayaatof the Quran, they turned to him for clarification and guidance, and he ﷺ would teach and guide them. In this hadeeth, ‘Adiy ibnHaatim(may Allah be pleased with him)reports that when the following ayah was revealed (which means): {And eat and drink until the white thread of dawn becomes distinct to you from the black thread [of night]} [Quran 2:187], it was prescribed for Muslims to eat and drink all night long until dawn, and prior to that they were only allowed to eat and drink after Maghrib prayer until they went to bed. Whenever any of them went to bed, it was not allowed to eat or drink on that night and on the following day as well (until the Maghreb prayer), as narrated in Saheeh Al-Bukhaaree. ‘Adiy ibn Haatim(may Allah be pleased with him) understood that the wording of the ayahto be literal,that it meant actualwhite and black threads, and that it is allowable to eat and drink until one could distinguish between them, i.e., after sunrise. Therefore, he brought two ropes (black and white ones) and put them under his pillow to preserve them so that he could easily look at them without having to get up. He would raise the pillow and look at them to determine the beginning of the fast day. After dawn,he would look at the two ropes, but hecould not distinguish the white from the black one, for the daylight was still faint. Whereupon he (may Allah be pleased with him)went to the Messenger of Allah ﷺand told him the whole story. The Messenger of Allah he ﷺexplained that the correct meaning of theayahwas not to be able to see clearly actualwhite and black threads, but rather meant the ability to distinguish the blackness of the night from the whiteness of the morning, i.e., after dawn, and that the break of dawn was the time limit for the end of the night and the beginning of the morning.This means that whoever wishes to observe fasting is required to abstain from eating and drinking upon seeing that clear and prominent sign, i.e., the break of dawn..