Aya number 77 of surat An-Nisa

Have you not seen those who were told, "Restrain your hands [from fighting] and establish prayer and give zakah"? But then when fighting was ordained for them, at once a party of them feared men as they fear Allah or with [even] greater fear. They said, "Our Lord, why have You decreed upon us fighting? If only You had postponed [it for] us for a short time." Say, The enjoyment of this world is little, and the Hereafter is better for he who fears Allah . And injustice will not be done to you, [even] as much as a thread [inside a date seed]."