Musnad Ahmad 26:221

Abu Sa’id—who is the freed slave of Banu Hashim—narrated to us, Dawud ibn Abi al-Furat narrated to us, Muhammad ibn Zayd narrated to us, from Abu al-A’yan al-‘Abdi, from Abu al-Ahwas al-Jushami, from Ibn Mas’ud, who said: We asked the Messenger of Allah, peace and blessings of Allah be upon him, about the monkeys and the swine: Are they from the offspring of the Jews? The Messenger of Allah, peace and blessings of Allah be upon him, said: "Allah has never cursed a people and transformed them, such that they would have offspring until He destroys them. Rather, Allah, the Almighty and Majestic, became angry with the Jews, so He transformed them and made them like them."