Aal-'Imran - 3:179

مَّا كَانَ اللّهُ لِيَذَرَ الْمُؤْمِنِينَ عَلَى مَا أَنتُمْ عَلَيْهِ حَتَّىَ يَمِيزَ الْخَبِيثَ مِنَ الطَّيِّبِ وَمَا كَانَ اللّهُ لِيُطْلِعَكُمْ عَلَى الْغَيْبِ وَلَكِنَّ اللّهَ يَجْتَبِي مِن رُّسُلِهِ مَن يَشَاء فَآمِنُواْ بِاللّهِ وَرُسُلِهِ وَإِن تُؤْمِنُواْ وَتَتَّقُواْ فَلَكُمْ أَجْرٌ عَظِيمٌ
[3:179]
On no account will Allah leave the believers in the condition which you are in until He separates the evil from the good; nor is Allah going to make you acquainted with the unseen, but Allah chooses of His messengers whom He pleases; therefore believe in Allah and His messengers; and if you believe and guard (against evil), then you shall have a great reward.
Allah will not leave the believers in the state in which ye are now, until He separates what is evil from what is good nor will He disclose to you the secrets of the Unseen. But He chooses of His Messengers (For the purpose) whom He pleases. So believe in Allah. And His messengers: And if ye believe and do right, ye have a reward without measure.
It is not (the purpose) of Allah to leave you in your present state till He shall separate the wicked from the good. And it is not (the purpose of) Allah to let you know the Unseen. But Allah chooseth of His messengers whom He will, (to receive knowledge thereof). So believe in Allah and His messengers. If ye believe and ward off (evil), yours will be a vast reward.