Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) narrates from the Prophet (peace and blessings be upon him): "Whoever kills a sparrow without its right will be questioned about it on the Day of Resurrection." It was asked: "What is its right?" He (peace and blessings be upon him) said: "Slaughter it and eat it; do not slaughter it only to throw it away."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19131