Surah Al-Imran, ayah 41

3:41

قَالَ رَبِّ ٱجۡعَل لِّيٓ ءَايَةٗۖ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَٰثَةَ أَيَّامٍ إِلَّا رَمۡزٗاۗ وَٱذۡكُر رَّبَّكَ كَثِيرٗا وَسَبِّحۡ بِٱلۡعَشِيِّ وَٱلۡإِبۡكَٰرِ ٤١

Qāla rabbij'al lī āyatan qāla āyatuka allā tukalliman-nāsa thalāthata ayyāmin illā ramzan wadhkur rabbaka kathīran wasabbih bil-'ashiyyi wal-ibkār

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."