Al-'Imran (The Family of Imran)
Surah 3 · Verse 179
Allah will not leave the believers in the condition in which you are, (this is only) till He separates the evil from the good, and Allah will not disclose to you the unseen but Allah chooses from among His messengers whom He wills; so believe in Allah and His messengers and if you believe and guard (against evil), then for you there is a great reward.
“The purpose of the tussle between the believers and the infidels is to separate the good from the evil, the period of this tussle was not disclosed to the believers. Allah (SWT) discloses the unseen to whom He wills of His messengers. This much is certain and disclosed that the believers will have a great reward for their efforts.”
