Anas radiyallahu anhu says, Rasoolullah sallallahu alaihe wasallam used to associate with us and joke. I had a younger brother. Rasoolullah sallallahu alaihe wasallam said to him, "Aba Umayr, what happened to the Nughayr?" (ES)
English reference (ES): Book 35, Hadith 226 (ES)
Arabic reference (ES): Book 36, Hadith 236 (ES)