Surah Al-'Ankabut 29:3

وَلَقَدْ فَتَنَّا ٱلَّذِينَ مِن قَبْلِهِمْ ۖ فَلَيَعْلَمَنَّ ٱللَّهُ ٱلَّذِينَ صَدَقُوا۟ وَلَيَعْلَمَنَّ ٱلْكَـٰذِبِينَ

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.

Translation: Saheeh International

Tafsir

And certainly We tried those who were before them. So God shall surely know those who are sincere in their faith — a knowledge of direct vision — and He shall surely know those who are liars regarding it.

Excerpt from Tafsir al-Jalalayn, commentary on 29:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.