What is the ruling on a will established by witness testimony or admission by heirs?

Primary text

If a will is established through valid witness testimony or through the admission of the heirs regarding its contents, its ruling is confirmed and acted upon. This remains in effect even if a long time passes or the conditions of the bequeathed property change, such as the testator recovering from an illness during which the will was made but later dying from a different cause or being killed. The underlying principle is that the will remains valid unless there is certain knowledge of its revocation, as mere possibility or doubt does not negate established rulings.