قَالَ رَبِّ ٱجْعَل لِّىٓ ءَايَةً قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَٰثَ لَيَالٍ سَوِيًّا ١٠
Qaala rabbij`al lee aayah, qaala aayatuka allaa tukalliman-naasa thalaatha layaalin sawiyyaa
[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."
- i.e., without illness or defect.