Musnad Ahmad 26:200

Abdullah ibn Yazid and Yunus narrated to us, they said: Dawud narrated to us, from Muhammad ibn Zayd, 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 when He destroys them. Rather, this is a creation that existed; so when Allah became angry with the Jews, He transformed them and made them like them."