رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1514
The Book of the Prohibited actions
The Prohibition of Backbiting and the Commandment of Guarding one's Tongue
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ سَمِعَ النَّبِيَّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ يَقُولُ: “إِنَّ الْعَبْدَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مَا يَتَبَيَّنُ فِيهَا يَزِلُّ بِهَا إلى النَّارِ أَبْعَدَ مِمَّا بَيْنَ الْمَشْرِقِ والمغرب" ((مُتَّفَقٌ عَلَيْهِ)). ومعني: يتبين يتفكر أنها خير أم لا.
Abu Hurairah (May Allah be pleased with him) reported: I heard the Prophet (ﷺ) saying, "A person utters a word thoughtlessly (i.e., without thinking about its being good or not) and, as a result of this, he will fall down into the fire of Hell deeper than the distance between the east and the west." [Al-Bukhari and Muslim].
Riyad as-Salihin, 1514