Anas b. Malik said:

The Messenger of Allah ﷺ used to come to visit us. I had a younger brother who was called Abu ‘Umair by Kunyah (surname). He had a sparrow with which he played, but it died. So one day the prophet ﷺ came to see him and saw him grieved. He asked: What is the matter with him? The people replied: His sparrow has died. He then said: Abu ‘Umair! What has happened to the little sparrow?

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، حَدَّثَنَا ثَابِتٌ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يَدْخُلُ عَلَيْنَا وَلِي أَخٌ صَغِيرٌ يُكْنَى أَبَا عُمَيْرٍ وَكَانَ لَهُ نُغَرٌ يَلْعَبُ بِهِ فَمَاتَ فَدَخَلَ عَلَيْهِ النَّبِيُّ ﷺ ذَاتَ يَوْمٍ فَرَآهُ حَزِينًا فَقَالَ " مَا شَأْنُهُ " . قَالُوا مَاتَ نُغَرُهُ فَقَالَ " يَا أَبَا عُمَيْرٍ مَا فَعَلَ النُّغَيْرُ " .