Quran Al-'Ankabut 29:3
وَلَقَدۡ فَتَنَّا ٱلَّذِينَ مِن قَبۡلِهِمۡۖ فَلَيَعۡلَمَنَّ ٱللَّهُ ٱلَّذِينَ صَدَقُواْ وَلَيَعۡلَمَنَّ ٱلۡكَٰذِبِينَ ٣
Translation
But We have certainly tried those before them, and Allāh will surely make evident those who are truthful, and He will surely make evident the liars.