Musannaf Ibn Abi Shaybah

Hazrat Abu al-Duha narrates that Hazrat Dihhak bin Qais used to say, O people! Teach the Qur'an to your children and family members. Thus, the reward for this is written in the record of deeds of any Muslim, and it will admit him to Paradise. Two angels will come to him and protect him. They will both say to him: Keep reciting the Qur'an and keep ascending the ranks of Paradise. Until they both settle him at the place where his knowledge of the Qur'an is complete.