Hadith 1518

Ibn 'Umar (May Allah be pleased with them) reported: The Messenger of Allah (PBUH) said, "Do not indulge in excessive talk except when remembering Allah. Excessive talking without the Remembrance of Allah hardens the heart; and those who are the farthest from Allah are those whose hearts are hard."

[At-Tirmidhi]

- وعن ابن عمر رضي الله عنهما قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏"‏لا تكثروا الكلام بغير ذكر الله، فإن كثرة الكلام بغير ذكر الله تعالى قسوة للقلب‏!‏ وإن أبعد الناس من الله القلب القاسي‏"‏‏.‏ رواه الترمذي‏.‏

Reference: 1715080
In-book reference: Book 17, Hadith 1518
Hadith 1518 - The Book of the Prohibited actions - Riyad as-Salihin - Sunnah.com