Musnad Ahmad 25:1142

Yahya ibn Adam narrated to us, Isra'il narrated to us, from Simak, from 'Ikrimah, from Ibn 'Abbas, who said: "It was said to the Messenger of Allah, may Allah bless him and grant him peace, when he finished from Badr: 'Go after the caravan, there is nothing else besides it.'" He said: "Then Al-'Abbas called out to him: 'It is not appropriate for you; indeed, Allah promised you one of the two parties, and He has given you what He promised you.'"