Hadith 5894
Sayyiduna Amr bin Shuraid (may Allah be pleased with him) narrates: I heard the Noble Prophet (peace and blessings be upon him) say: "Whoever kills a sparrow without reason, then that sparrow will complain to Allah Almighty on the Day of Resurrection, saying, 'O my Lord, so-and-so killed me without reason; he did not kill me for any benefit.'"