قَالَ رَبِّ اجْعَل لِّي آيَةً قَالَ آيَتُكَ أَلَّا تُكَلِّمَ النَّاسَ ثَلَاثَ لَيَالٍ سَوِيًّا
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سورة مريم
(19/10) He said: my Lord appoint for me a sign. Allah said: thy sign is that thou shalt not speak unto mankind for three nights, while sound.
Surah Maryam