I say, and with God's success: It begins from the rise of the spreading dawn in the horizon – which is called the true dawn – until the sun rises. So, there are two dawns: a false dawn - which the Arabs call the tail of the deer - and it is the whiteness that appears in the sky lengthwise and is followed by darkness, and a true dawn: which is the whiteness that spreads in the horizon; as his Prophet Muhammad (peace be upon him) said: "Let not the call of Bilal deceive you regarding your pre-dawn meal, nor the whiteness of the horizon spreading like this until it spreads like this," and Hamad illustrated it with his hands, saying: "meaning horizontally," in Sahih Muslim 2: 770. In another narration: "Let not the call of Bilal prevent any of you from having his pre-dawn meal, for he calls or announces; to awaken your sleeping ones and to return your standing ones. He said: And it is not to say - meaning the dawn -: like this, or he said: like this, but until he says: like this and like this, meaning lengthwise, but like this means widthwise," in Sahih Ibn Khuzaymah 3: 210. See: the footnote of Al-Tahawi on Al-Durr Al-Mukhtar 1: 173, and God knows best.