Targum zu Kohelet 8:14

There is a vanity that is decreed to be done upon the face of the earth; there are righteous to whom evil happens as if they had done like the deeds of the wicked, and there are wicked to whom it happens as if they had done like the works of the righteous; and I saw by the Holy Spirit that the evil which happens to the righteous in this world is not for their guilt, but to free them from a slight transgression, that their reward may be perfect in the world to come; and the good that comes to the sinners in this world is not for their merits, but to render them a reward for their small merit they have acquired, so that they may eat their reward in this world, and to destroy their portion in the world to come; I said, by my word, this also is vanity.