Quran 19:10 from Surah Maryam on Divine Marvels.
قَالَ رَبِّ ٱجۡعَل لِّيٓ ءَايَةٗۖ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَٰثَ لَيَالٖ سَوِيّٗا
English translation: He said My Lord! Make for me a sign He said Your sign (is) that not you will speak (to) the people (for) three nights sound
Transliteration: qala rabbi ij'al li ayatan qala ayatuka alla tukallima al-nasa thalatha layalin sawiyyan