Sura Maryam 19:26

فَكُلِى وَٱشْرَبِى وَقَرِّى عَيْنًا فَإِمَّا تَرَيِنَّ مِنَ ٱلْبَشَرِ أَحَدًا فَقُولِىٓ إِنِّى نَذَرْتُ لِلرَّحْمَٰنِ صَوْمًا فَلَنْ أُكَلِّمَ ٱلْيَوْمَ إِنسِيًّا

fa-kulī wa-ishrabī wa-qarrī ʿaynan fa-immā tarayinna mina l-bashari aḥadan fa-qūlī innī nadhartu lil-raḥmāni ṣawman falan ukallima l-yawma insiyyan

"So eat and drink and cool (thine) eye. And if thou dost see any man, say, 'I have vowed a fast to (Allah) Most Gracious, and this day will I enter into not talk with any human being'"