Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever kills a sparrow unjustly, Allah Almighty will question him about it on the Day of Resurrection." It was asked: What is its right? He (peace and blessings be upon him) said: "Its right is that you slaughter it and then eat it."