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?" (IT)
English reference (IT): Book 35, Hadith 226 (IT)
Arabic reference (IT): Book 36, Hadith 236 (IT)