Musannaf Ibn Abi Shayba 33:568

Jarir narrated to us, from Mansur, from Abu al-Duha, who said: Al-Dahhak ibn Qays used to say: "O people, teach your children and your families the Quran, for whoever among the Muslims Allah has decreed to enter Paradise, two angels will come to him and flank him, and they will say to him: 'Recite and ascend the degrees of Paradise,' until they bring him to where his work of the Quran ends."