Chapter 32: Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at)
Narrated Abu Sa' id al-Khudri: The Prophet (ﷺ) said: A man from the Illiyyun will look downwards at the people of Paradise and Paradise will be glittering as if it were a brilliant star. He (the narrator) said: In this way the word durri (brilliant) occurs in this tradition, i. e. the letter dal (d) has short vowel u and it has no hamzah ('). Abu Bakr and Umar will be of them and will have some additional blessings.
Sunan Abi Dawud 3987