(17:105) And with the truth We have sent the Qur`an down, and with the truth it has descended. And We have not sent you, [O Muhammad], except as a bringer of good tidings and a warner. (17:106) And [it is] a Qur`an which We have separated [by intervals] that you might recite it to the people over a prolonged period. And We have sent it down progressively.