from Anas bin Malik that the Messenger of Allah (ﷺ) said: "The rewards for my Ummah were displayed before me, even (the reward for) the dust that a man comes out of the Masjid with. The sins of my Ummah were displayed before me, and I have not seen a sin worse than a Surah or Ayah of the Qur'an which a man learned and then forgot."
Jami` at-Tirmidhi Book 45, Hadith 42
← Previous Hadith that the Prophet (ﷺ) said: "The one who memorized the Qur'an shall come on the Day of Judgement and (the reward for reciting the Qur'an) says: 'O Lord! Decorate him." So he is donned with a crown of nobility. Then it says: "O Lord! Give him more!' So he is donned with a suit of nobility. Then it says: "O Lord! Be pleased with him.' So He is pleased with him and says: "Recite and rise up, and be increased in reward with every Ayah.'"

Jami` at-Tirmidhi Book 45, Hadith 41 Next Hadith → that 'Imran bin Husain passed by a reciter reciting then he began begging. So he ('Imran) said: 'Indeed we are from Allah and to Him shall we return.' Then he said: 'I heard the Messenger of Allah (ﷺ) saying: 'Whoever recites the Qur'an, then let him ask Allah by it. For indeed there will come a people, who will recite the Qur'an, asking from the people because of it.'"

Jami` at-Tirmidhi Book 45, Hadith 43