Musnad Ahmad 3972

It was narrated that Ibn Mas'ood said: We asked the Messenger of Allah (ﷺ) about monkeys and pigs: were they offspring of the Jews? The Messenger of Allah (ﷺ) said: "Allah, may He be glorified and exalted, never cursed a people - Rawh said: and transformed them - then they had offspring until He destroyed them. Rather these (i.e., monkeys and pigs) are a creation that existed before. When Allah, may He be glorified and exalted, got angry with the Jews, He transformed them and made them like them.”