Imam al-Baqir(AS) has said:

"O Sa'd, learn the Quran, for it comes on the Day of Judgement in the best of forms.  It will pass through each rank of the masses of the believers, the martyrs, the Prophets, and the ranks of the angels; and all of them will say: 'This is brighter than us,' until the Messenger of Allah will introduce it."

Adaabus Salat taken from Usool-e-Kaafi
vol 4, page 394