Quran 13.28-30
Who have believed and whose hearts have rest in the remembrance of Allah. Verily in the remembrance of Allah do hearts find rest! Those who believe and do right: Joy is for them, and bliss (their) journey's end. Thus We send thee (O Muhammad) unto a nation, before whom other nations have passed away, that thou mayst recite unto them that which We have inspired in thee, while they are disbelievers in the Beneficent. Say: He is my Lord; there is no God save Him. In Him do I put my trust and unto Him is my recourse.