The Holy Quran
O you who believe, seek assistance through patience and prayer; surely Allah is with the patient. And speak not of those who are slain in Allah's way as dead. Nay, (they are) alive, but you perceive not. And We shall certainly try you with something of fear and hunger and loss of property and lives and fruits. And give good news to the patient, Who, when a misfortune befalls them say: 'Surely we are Allah's and to Him we shall return.' Those are they on whom are blessings and mercy from their Lord; and those are the followers of the right course.
— Quran