Surah Al-'Ankabut, ayah 3

وَلَقَدۡ فَتَنَّا ٱلَّذِينَ مِن قَبۡلِهِمۡۖ فَلَيَعۡلَمَنَّ ٱللَّهُ ٱلَّذِينَ صَدَقُواْ وَلَيَعۡلَمَنَّ ٱلۡكَٰذِبِينَ ٣

Walaqad fatannal-ladhīna min qablihim falaya'lamannallāhul-ladhīna sadaqū walaya'lamannal-kādhibīn

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.