Anas ibn Malik said, "The Prophet, may Allah bless him and granthim peace, used to mix with us to the extent of asking a younger brotherof mine, 'Abu 'Umayr! What has happened to the little sparrow?'" (RU)
English reference (RU): Book 14, Hadith 269 (RU)
Arabic reference (RU): Book 1, Hadith 269 (RU)