Albert Barnes Commentary Judges 3:15

"But when the children of Israel cried unto Jehovah, Jehovah raised them up a saviour, Ehud the son of Gera, the Benjamite, a man left-handed. And the children of Israel sent tribute by him unto Eglon the king of Moab." — Judges 3:15 (ASV)

But when the children of Israel cried to the Lord, the Lord raised them up a deliverer—These are the very same words as are used in Judges 3:9. See also Judges 2:16, Judges 2:18, and Nehemiah 9:27.

Ehud “the Benjamite” was of the family or house of Gera (2 Samuel 16:5), the son of Bela, Benjamin’s first-born, born before Jacob’s descent into Egypt (Genesis 46:21), and then included among “the sons of Benjamin.” The genealogy in 1 Chronicles 8:6 intimates that Ehud (apparently written Abihud in Judges 3:3) became the head of a separate house.

Left-handed—See the margin. The phrase is thought to describe not so much a defect as the power to use left and right hands equally well (1 Chronicles 12:2).

A present—that is, tribute (2 Samuel 8:2, 2 Samuel 8:6; 1 Kings 4:21; Psalms 72:10). The employment of Ehud for this purpose points him out as a chief of some distinction. He would be attended by a numerous suite (Judges 3:18). We may conclude that the destruction of the Benjamites (Judges 20) had not taken place at this time.