Unknown Author
Judges 3:31ESV·author unknown

After him was Shamgar the son of Anath, who killed 600 of the Philistines with an oxgoad, and he also saved Israel.

Matthew Henry Presbyterian @wholebiblehenry

When it is said the land had rest eighty years, some think it meant chiefly of that part of the land which lay eastward on the banks of Jordan, which had been oppressed by the Moabites; but it seems, by this passage here, that the other side of the country which lay south-west was in that time infested by the Philistines, against whom Shamgar made head. 1.

Jamieson-Fausset-Brown Reformed @jfbcommentary

after him was Shamgar--No notice is given of the tribe or family of this judge; and from the Philistines being the enemy that roused him into public service, the suffering seems to have been local--confined to some of the western tribes. slew . . . six hundred men with an oxgoad--This instrument is eight feet long and about six inches in circumference.

Keil & Delitzsch Lutheran @keilanddelitzsch

Jdg 3:31 After him (Ehud) was, i.e., there rose up, Shamgar the son of Anath. He smote the Philistines, who had probably invaded the land of the Israelites, six hundred men, with an ox-goad, so that he also (like Othniel and Ehud, Jdg 3:9 and Jdg 3:15) delivered Israel. הבּקר מלמד, ἁπ.