Surah Maryam, ayah 10

قَالَ رَبِّ ٱجۡعَل لِّيٓ ءَايَةٗۖ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَٰثَ لَيَالٖ سَوِيّٗا ١٠

Qāla rabbij'al lī āyatan qāla āyatuka allā tukalliman-nāsa thalātha layālin sawiyyā

[Zechariah] said, "My Lord, make for me a sign." He said, "Your sign is that you will not speak to the people for three nights, [being] sound."⁸¹¹