Distinction between sincere and insincere believers

وَلَنَبْلُوَنَّكُمْ حَتَّىٰ نَعْلَمَ ٱلْمُجَـٰهِدِينَ مِنكُمْ وَٱلصَّـٰبِرِينَ وَنَبْلُوَا۟ أَخْبَارَكُمْ

And We will surely test you until We make evident those who strive among you [for the cause of Allāh] and the patient, and We will test your affairs.