Musnad Ahmad 3724

It was narrated that Ibn Mas’ood (رضي الله عنه) said: We asked the Messenger of Allah (ﷺ) about monkeys and pigs - were they the offspring of the Jews? The Messenger of Allah (ﷺ) said: "Allah never cursed any people and transformed them, then gave them offspring when He caused their doom. These (animals) are a creation that existed before. When Allah got angry with the Jews, He transformed them and made them like them.”