Isaiah 30:26

Moreover, the light of the moon shall be as the light of the sun, equal to it in brightness, and the light of the sun shall be sevenfold, as the light of seven days, in the day, the time to which the entire Old Testament looked forward, that the Lord bindeth up the breach of His people, the calamity which had struck them on account of their sins, and healeth the stroke of their wound. The entire passage pictures the spiritual splendor of the Messianic era.