Surah Maryam 19:10

قَالَ رَبِّ ٱجْعَل لِّىٓ ءَايَةً ۚ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَـٰثَ لَيَالٍ سَوِيًّا

[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."

Translation: Saheeh International

Tafsir

He said ‘Lord appoint for me some sign’ namely some indication of my wife’s becoming pregnant. Said He ‘Your sign for this is that you shall not speak to people that is that you should refrain from speaking to them but not from speaking the remembrance of God exalted be He for three nights that is together with the …

Excerpt from Tafsir al-Jalalayn, commentary on 19:10, via Quran.com. The reader has the full commentary and 9 more tafsirs.