question #1 Sahih Muslim 1094b, Book 13, Hadith 51 : What is the significance of distinguishing between the true dawn and the false dawn in Islamic practices?

The Adhan of Bilal should not mislead you nor the whiteness (of the pillar) of dawn, for it is not the whiteness of the true dawn, but that of the false dawn which is vertical like a pillar and you can eat food till the streaks of whiteness spread like it.