It was narrated that 'Amr bin Sharid said: "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”"
DaifDaifDaifBook 43 · Hadith 86