It is narrated from Sayyiduna Abu Bakr (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Modesty is part of faith, and the person of faith will be in Paradise. Foul language is from harshness, and the harsh person will be in Hell."
Hadith Referenceالادب المفرد / كتاب / 1314
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه ابن ماجه ، كتاب الزهد ، باب الحياء : 4184 - أنظر الصحيحة : 49»
Explanation & Benefits
Shaykh Maulana Usman Muneeb
Benefits and Issues: A person’s success in this world and the Hereafter is greatly influenced by the tongue. On one occasion, Sayyiduna Mu’adh radi Allahu anhu asked: “O Messenger of Allah! Will we also be held accountable for what we say with our tongues?” The Prophet sallallahu alayhi wa sallam replied: “May your mother lose you! Are people not thrown on their faces into Hellfire except as a result of what their tongues have harvested?” Therefore, one should refrain from obscene speech and foul language in order to be saved from Hellfire.
Source: Fadlullah al-Ahad: Urdu Commentary on al-Adab al-Mufrad, Page: 1314