Translation:

51. And is it not enough for them that We have sent down to thee the Book which is rehearsed to them? Verily in it is Mercy and Reminder to those who believe.

Notes (Tafseer)

3482. The perspicuous Qur-an, explained in detail by Allah's Messenger, in conjunction with Allah's Signs in nature and in the hearts of men, should be enough for all. It is mere fractious opposition to demand vaguely something more. Cf. also vi. 124, and n. 946.