Why did Jacob (peace be upon him) say to his sons, "Rather, your souls have enticed you to [do] something," after they had assured him of their truthfulness in the story of Joseph and his brother?

Al-Alusi answered that the striking (or turning away) in "bal sawwalat" (rather, it tempted) is not about their explicit words, but about what they imply, namely, their claim of innocence from causing what befell Joseph, and that what emanated from them is what caused it. Ibn al-Jawzi mentioned that the intended meaning is that their souls tempted them into believing that he (Joseph's brother) stole, while he had not actually stolen. Ibn Atiyyah and Ibn Ashour mentioned that he (Jacob) accused them based on their previous actions towards Joseph, and relying on his knowledge that his son does not steal, and that a prophet is permitted to err in judgment regarding customary matters.