Musannaf Ibn Abi Shaybah

Hazrat Zaid bin Wahb narrates that a large vessel of food was brought from the house of Hazrat Hafsa, so people thought that the sun had set. That day it was cloudy, so the people broke their fast. After a while, the clouds cleared and the shining sun became visible. Upon this, Hazrat Umar said that we could not avoid sin.