Rashi on Isaiah
and the yoke shall be destroyed The yoke of Sennacherib shall be destroyed because of Hezekiah, who was mild to his generation, as oil. Our Rabbis, however, explained [that Sennacherib’s yoke would be destroyed] because of Hezekiah’s oil which burnt in the synagogues and in the study-halls, for he persuaded them to engage in Torah, after the matter that is written (Proverbs 25: 1): “Which the men of Hezekiah strengthened.”