Is removing the mold layer from fig jam sufficient for its use, or does the mold make the entire quantity prohibited for use?

The fundamental principle concerning substances is purity, unless there is evidence indicating their impurity. There is no evidence to suggest the impurity of food that has changed due to prolonged storage. Nor can the altered layer of such food be deemed intoxicating; it remains pure. There is no harm in consuming it, as long as it is not detrimental. There are narrations indicating the purity and permissibility of consuming food that has changed, even if its smell has become foul. The correct view is that it is disliked to eat foul-smelling food, but not forbidden, unless there is a fear of harm from it.