This is another article in the chapter Probable Enormities from the classical manual on Sharia called Reliance of the Traveller. The articles are posted one by one in the order they are given in the book.
p75.8 The Prophet (Allah bless him and give him peace) said:
(1) “Modesty is of faith, and faith is in paradise. Vulgarity is of rudeness, and rudeness is in hell.”
(2) “Allah detests the foulmouthed, vulgar person.”