Anas said, "The Prophet, may Allah bless him and grant him peace, visited us. I had a young brother who used the kunya of Abu 'Umayr. He had a sparrow which he used to play with it and it had died. The Prophet, may Allah bless him and grant him peace, came it and saw that he was sad. He asked, 'What is wrong with him?' He was told, 'His sparrow has died.' The Prophet said, 'Abu 'Umayr, what has happened to the little sparrow?'"