Quran 56:25 from Surah Al-Waaqia on Divine Marvels.
لَا يَسۡمَعُونَ فِيهَا لَغۡوٗا وَلَا تَأۡثِيمًا
English translation: Not they will hear therein vain talk and not sinful (speech)
Transliteration: la yasma'una fiha laghwan wala tathiman