Midrasch zu Jeschijahu 35:4

Because Egypt forced Israel to neglect the Law, concerning which it is written: But thou shalt meditate therein day and night (Josh. 1:8), I will exact punishment from it with a fire that shall not be quenched night nor day. Why was fire used? Because they burned “My house from which smoke poured forth” (the Temple), as it is said: And the house was filled with smoke (Isa. 6:4). Therefore, the smoke thereof shall go up forever (ibid. 39:4). But it also says: And thus the Sound of an uproar from the city (ibid. 66:6). And so the Holy One, blessed be He, said to them: Hark, it cometh from the Temple. Do you not remember what you did in the Temple? Hark! The Lord rendereth recompense to His enemies (ibid. 66:6). When will they be recompensed? This refers to the Messianic Age, as it is said: The messenger of the Lord, he will come, and he will save them (ibid. 35:4).