Job 20:18

“That which he laboured for shall he restore, etc.] This explains what was before figuratively expressed by vomiting, (<182015>Job 20:15); and is to be interpreted either of that which another laboured for; so the Targum paraphrases it, “another’s labour;” and Mr. Broughton renders it, “he shall restore what man’s pain get”: and then the sense is, that that which another got by his labour, coming by some means or another into the hand of this rapacious, covetous, wicked man, he shall be obliged to restore to him again; or the hire of the labourer being detained in his hands, he shall be forced to give it to him, as the Egyptians, by lending the Israelites their jewels of gold and silver,…”

“Image from food which is taken away from one before he can swallow it. restitution--(So Pro 6:31). The parallelism favors the English Version rather than the translation of GESENIUS, "As a possession to be restored in which he rejoices not." he shall not rejoice--His enjoyment of his ill-gotten gains shall then be at an end (Job 20:5).”

“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…”

“Swallow - So as to hold it. He shall not possess it long, nor to any considerable purpose. Yea, he shall be forced to part with his estate to make compensations for his wrongs. So that he shall not enjoy what he had gotten, because it shall be taken from him. Job 20:20”

“shall he restore: Job 20:10, Job 20:15 swallow: Job 20:5; Pro 1:12; Jer 51:34, Jer 51:44; Lam 2:16; Hos 8:7, Hos 8:8; Amo 8:4; Mat 23:14, Mat 23:24 his substance: Heb. the substance of his exchange and he shall: Job 31:25, Job 31:29; Isa 24:7-11; Jer 11:15, Jer 11:16, Jer 22:13, Jer 22:17; Eze 7:12; Hos 9:1; Jam 4:8, Jam 4:9 Job 20:19”