Sunan Abi Dawud Book 2, Hadith 72
If we left this door for women (it would have been better). Nafi' said: Ibn 'Umar did not enter (the door) until his death. The other except 'Abd al-Warith said: This was said by 'Umar (and not by Ibn 'Umar) and that is more correct.
The Prophet (ﷺ) said: The rewards of my people were presented before me, so much so that even the reward for removing a mote by a person from the mosque was presented to me. The sins of my people were also presented before me. I did not find a sin greater than that of a person forgetting the Qur'anic chapter or verse memorised by him.
This tradition has been reported by 'Umar b. al-Khattab through a different chain of narrators. He narrated it to the same effect and that is more correct.