From Sahih Bukhari (Hadith 3792):
Narrated Usaid bin Hudair:A man from the Ansar said, "O Allah's Messenger (ﷺ)! Will you appoint me as you have appointed so-and-so?" The Prophet (ﷺ) said, "After me you will see others given preference to you; so be patient till you meet me at the Tank (i.e. Lake of Kauthar). (on the Day of Resurrection)
Reference: Bukhari 3792