Surah Ali'Imran, Verse 41

قَالَ رَبِّ ٱجۡعَل لِّيٓ ءَايَةٗۖ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَٰثَةَ أَيَّامٍ إِلَّا رَمۡزٗاۗ وَٱذۡكُر رَّبَّكَ كَثِيرٗا وَسَبِّحۡ بِٱلۡعَشِيِّ وَٱلۡإِبۡكَٰرِ٤١

qāla rabbi ij'ʿal lī āyatan qāla āyatuka allā tukallima l-nāsa thalāthata ayyāmin illā ramzan wa-udh'kur rabbaka kathīran wasabbiḥ bil-ʿashiyi wal-ib'kāri

He said, "My Lord, make for me a sign." He said, "Your sign is that you will not [be able to] speak to the people for three days except by gesture. And remember your Lord much and exalt [Him with praise] in the evening and the morning."