Narrated by Ali ibn Ibrahim from his father from Ibn Abi ‘Umayr from Ali ibn ‘Atiyyah:
Abu Abdillah عليه السلام said: "The Subh (morning) is that which, when you see it spreading horizontally, it is as if it were the whiteness of a stream."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 39