Sahih Muslim
The Book of Games and the Animals which May be Slaughtered and the Aninals that Are to be Eaten (Kitab-us-Said wal-Dhabaih wa ma Yukalu min Al-Hayawan)
Book Number: 021 / Hadith Number: 4746
Abu Tha'laba reported Allah's Apostle (may peace be upon him) as saying about one who comes three days later on the game he has shot: Eat it, provided it has not gone rotten.