"There is no person who kills a small bird or anything larger for no just reason, but Allah, the Mighty and Sublime, will ask him about it." It was said: "O Messenger of Allah, what does just reason;' mean?" Her said: "That you slaughter it and eat it, and do not cut off its head and throw it aside." (Using translation from Nasāʾī 4349)   

«مَنْ قَتَلَ عُصْفُورًا فَمَا فَوْقَهَا بِغَيْرِ حَقِّهَا سَأَلَ اللهُ عَنْهَا يَوْمَ الْقِيَامَةِ» قِيلَ يَا رَسُولَ اللهِ وَمَا حَقُّهَا؟ قَالَ «حَقُّهَا أَنْ يَذْبَحَهَا فَيَأْكُلَهَا وَلَا يَقْطَعْ رَأْسَهَا فَيَرْمِي بِهَا»  

"I heard Sharid say: 'I herd the Messenger of Allah say: Whoever kills a small bird for no reason, it will beseech Allah on the Day of Resurrection saying: O Lord, so and so killed me for no reason. And he did not kill me for any beneficial purpose."' (Using translation from Nasāʾī 4446)  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ قَتَلَ عُصْفُورًا عَبَثًا عَجَّ إِلَى اللهِ يَوْمَ الْقِيَامَةِ يَقُولُ يَا رَبِّ إِنَّ فُلَانًا قَتَلَنِي عَبَثًا وَلَمْ يَقْتُلْنِي لِمَنْفَعَةٍ