On forbidding obscene and coarse language

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

327. Chapter: On forbidding obscene and coarse language

1734. Ibn Mas'ud reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "A believer is not a defamer, a curser, obscene or coarse." [at-Tirmidhi]

1735. Anas reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "There is no obscenity in a thing without that marring it, and there is no modesty in a thing without that adorning it." [at-Tirmidhi]