Mutarrif from the tribe of Banu Amir bin Sa sa ah narrated that "Uthman bin Abul- As Ath-Thaqafi invited him to drink some milk that he poured for him.Mutarrif said: "I am fasting." "Uthman said: "I heard the Messenger of Allah ﷺ say: Fasting is a shield against the Fire just like the shield of anyone of you against fighting." (Sahih)