On commanding the faster to guard his tongue and limbs from incorrect actions, verbal abuse and the like

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

223. Chapter: On commanding the faster to guard his tongue and limbs from incorrect actions, verbal abuse and the like

1240. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "When someone is fasting, he should not have sexual relations nor quarrel. If someone fights him or insults him, he should say, 'I am fasting'" [Agreed upon]

1241. Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said, "Allah does not require someone who does not abandon lies, and acting by them, while fasting to abandon his food and drink." [al-Bukhari]