It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
"When anyone of you is fasting, let him not utter evil orignorantspeech. If anyone speaks to him in an ignorant manner, lethim say:'I am fasting.'"
English reference: Vol. 1, Book 7, Hadith 1691
Arabic reference: Book 7, Hadith 1761