Albert Barnes Commentary Job 20:28

"The increase of his house shall depart; [His goods] shall flow away in the day of his wrath." — Job 20:28 (ASV)

The increase of his house shall depart - The Septuagint says, “Destruction shall bring his house to an end.” The word rendered “depart” (יגל yîgel from גלה gâlâh) properly means “shall go into captivity.” The sense is that whatever he had laid up in his house would entirely disappear.

His goods shall flow away - What he had gained would seem to flow away like water.

In the day of his wrath - This refers to the wrath of God—as the connection demands.