Qur'an, Al-Hadid, Surah 57:7-8
Put your faith in God and his apostle. Give generously from what he has given you. Those who have faith and give generously, will be richly rewarded. When the apostle invites you to put your faith in God, what reason have you for refusing? After all, God has entered a covenant with you; so if you are true believers, trust him.