Surat Al-`Ankabūt - سورة العنكبوت

وَلَيَعْلَمَنَّ اللَّهُ الَّذِينَ آمَنُوا وَلَيَعْلَمَنَّ الْمُنَافِقِينَ

Muhsin Khan: Verily, Allah knows those who believe, and verily, He knows the hypocrites [i.e. Allah will test the people with good and hard days to discriminate the good from the wicked (although Allah knows all that before putting them to test)].