Hadith 1992
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "When any one of you is fasting, he should neither use obscene or foul language nor act ignorantly, and if someone behaves ignorantly towards him, he should say: 'Indeed, I am fasting.'" In the narration of Ashajj, it is stated: "When it is the day of fasting for any one of you..."