Further, since olive oil, which hitherto had been prescribed for the valid administration of the sacrament, is unobtainable or difficult to obtain in some parts of the world, we decreed, at the request of numerous bishops, that in the future, according to the circumstances, oil of another sort could also be used, provided it were obtained from plants, inasmuch as this more closely resembles the matter indicated in Holy Scripture.
tunc a veneratione Augusti orsus flexit ad victorias triumphosque Tiberii, praecipuis laudibus celebrans quae apud Germanias illis cum legionibus pulcherrima fecisset.vatican.va vatican.va