مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2048
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas said: The Messenger of Allah (ﷺ) said: "If you send out the (hunting) dog and it eats some of the prey, do not eat it for he only caught it for himself. But if you send him out and he kills (the prey) but does not eat any of it, then eat it, for he killed it for his master."
Musnad Ahmad 2049Saheeh because of corroborating evidence, its isnad is da'ee