4:77Have you not considered those who were told, “Restrain your hands, and perform your prayers, and spend in regular charity”? But when fighting was ordained for them, a faction of them feared the people as God is ought to be feared, or even more. And they said, “Our Lord, why did You ordain fighting for us? If only You would postpone it for us for a short while.” Say, “The enjoyments of this life are brief, but the Hereafter is better for the righteous, and you will not be wronged one bit.”

4:103When you have completed the prayer, remember God, standing, or sitting, or on your sides. And when you feel secure, perform the prayer. The prayer is obligatory for believers at specific times.