Sayyiduna Abu Tha'labah al-Khushani (may Allah be pleased with him) narrates from the Messenger of Allah (peace and blessings be upon him) that, concerning game that is found after three days, he said: "It may be eaten as long as it has not begun to stink."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18911