Charles Ellicott Commentary Judges 3:12

"And the children of Israel again did that which was evil in the sight of Jehovah: and Jehovah strengthened Eglon the king of Moab against Israel, because they had done that which was evil in the sight of Jehovah." — Judges 3:12 (ASV)

Did evil again. —Literally, “ added to do evil.” We find this Hebraism even in the New Testament. “He added (prosetheto) to send” (Luke 20:11–12).

Evil. —Literally, the evil, with special reference to idolatry, as in Judges 2:11 and following.

Strengthened Eglon the king of Moab. —See this event referred to by the prophet Samuel, in 1 Samuel 12:9. Eglon was a successor of Balak. We have seen that Rishathaim is probably a term of hatred or scorn; is the name Eglon due to the same tendency? It may be so, since Eglon means “a fat bullock” (Amos 4:1).