That which he laboured for shall he restore - This means that he shall give back the profit of his labor. He shall not be permitted to enjoy it or to consume it.
And shall not swallow it down - Shall not enjoy it; shall not eat it. He shall be obliged to give it to others.
According to his substance shall the restitution be - literally, according to Gesenius, “As a possession to be restored in which one rejoices not.” The sense is, that all that he has is like property which a man has, which he feels not to be his own, but which belongs to another and which is soon to be given “up.” In such property a man does not find that pleasure which he does in that which he feels to be his own. He cannot dispose of it, and he cannot look on it and feel that it is his. So Zophar says it is with the wicked man. He can look on his property only as that which he will soon be compelled to part with, and not having any security for retaining it, he cannot rejoice in it as if it were his own. Dr. Lee, however, renders this, “As his wealth is, so shall his restitution be; and he shall not rejoice.” But the interpretation proposed above, seems to me to accord best with the sense of the Hebrew.