Quran 18:19 from Surah Al-Kahf on Divine Marvels.
وَكَذَٰلِكَ بَعَثۡنَٰهُمۡ لِيَتَسَآءَلُواْ بَيۡنَهُمۡۚ قَالَ قَآئِلٞ مِّنۡهُمۡ كَمۡ لَبِثۡتُمۡۖ قَالُواْ لَبِثۡنَا يَوۡمًا أَوۡ بَعۡضَ يَوۡمٖۚ قَالُواْ رَبُّكُمۡ أَعۡلَمُ بِمَا لَبِثۡتُمۡ فَٱبۡعَثُوٓاْ أَحَدَكُم بِوَرِقِكُمۡ هَٰذِهِۦٓ إِلَى ٱلۡمَدِينَةِ فَلۡيَنظُرۡ أَيُّهَآ أَزۡكَىٰ طَعَامٗا فَلۡيَأۡتِكُم بِرِزۡقٖ مِّنۡهُ وَلۡيَتَلَطَّفۡ وَلَا يُشۡعِرَنَّ بِكُمۡ أَحَدًا
English translation: And similarly We raised them that they might question among them Said a speaker among them How long have you remained They said We have remained a day or a part (of) a day They said Your Lord knows best how long you have remained So send one of you (with this) silver coin of yours with this (silver coin of yours) to the city and let him see which is the purest food and let him bring to you provision from it and let him be cautious And let not be aware about you anyone
Transliteration: wakadhalika ba'athnahum liyatasaalu baynahum qala qailun min'hum kam labith'tum qalu labith'na yawman aw ba'da yawmin qalu rabbukum a'lamu bima labith'tum fa-ib'athu ahadakum biwariqikum hadhihi ila al-madinati falyanzur ayyuha azka ta'aman falyatikum biriz'qin min'hu walyatalattaf wala yush'iranna bikum ahadan