Devarim 31:21

Orthodox Jewish Bible

²¹ And it shall come to pass, when ra’ot rabbot and tzarot are befallen them, that this shirah shall testify against them as an ed (witness); for it shall not be forgotten out of the mouths of their zera; for I know their yetzer (inclination) in which they go about, even now, before I have brought them into ha’aretz which I swore.