From Sahih Muslim (Hadith 2850):
Tawus reported on the authority of Ibn 'Abbas (Allah be pleased with them) that Zaid b. Arqam went to him (Ibn 'Abbas) and said:Narrate how you informed me about the meat of the game presented to the Messenger of Allah (ﷺ) as he was in the state of Ihram. Thereupon he said: He was presented with a slice of the meat of game, but he returned it to him (who presented it) saying: We are not going to eat it, as we are in the state of Ihram
Reference: Muslim 2850