Charles Ellicott Commentary 2 Samuel 23:18

"And Abishai, the brother of Joab, the son of Zeruiah, was chief of the three. And he lifted up his spear against three hundred and slew them, and had a name among the three." — 2 Samuel 23:18 (ASV)

Among three. —The Hebrew margin has “the three,” and so also the text in the following clause. “The three” are the triad of heroes just mentioned, of whom Abishai was first, Benaiah second, with an unnamed third. A somewhat similar feat of daring is told of Abishai in 1 Samuel 26:6–12.