العنكبوت — Al-'Ankabut Ayat 3
وَلَقَدْ فَتَنَّا الَّذِيْنَ مِنْ قَبْلِهِمْ فَلَيَعْلَمَنَّ اللّٰهُ الَّذِيْنَ صَدَقُوْا وَلَيَعْلَمَنَّ الْكٰذِبِيْنَ
Wa laqad fatannal-lażīna min qablihim falaya‘lamannallāhul-lażīna ṣadaqū wa laya‘lamannal-kāżibīn(a).
"But We have certainly tried those before them, and Allah will surely make evident those who are truthful, and He will surely make evident the liars."