SPEAK WELL OR REMAIN SILENT H 314 "Whosoever believes in Allah and the Last Day should be kind to his neighbor. Whosoever believes in Allah and the Last Day should honor his guest; and whosoever believes in Allah and the Last Day should speak well or remain silent." R 314 Muslim with a chain up to Abu Hurairah who related that the Prophet, praise and peace be upon him, said this.
314- وعنه أيضاً رضي الله عنه : أن رَسُول الله صلى الله عليه وآله وسلم ، قَالَ : "مَنْ كَانَ يُؤْمِنُ باللهِ وَاليَومِ الآخِرِ ، فَلْيُكْرِمْ ضَيْفَهُ ، وَمَنْ كَانَ يُؤْمِنُ باللهِ وَاليَومِ الآخِرِ ، فَلْيَصِلْ رَحِمَهُ ، وَمَنْ كَانَ يُؤْمِنُ بِاللهِ وَاليَومِ الآخِرِ ، فَلْيَقُلْ خَيْراً أَوْ لِيَصْمُتْ" مُتَّفَقٌ عَلَيهِ .