Charles Ellicott Commentary 1 Chronicles 27:6

"This is that Benaiah, who was the mighty man of the thirty, and over the thirty: and [of] his course was Ammizabad his son." — 1 Chronicles 27:6 (ASV)

This is that Benaiah, who was mighty among the thirty. —Literally, he, Benaiah, was a hero of the thirty. (Compare to 1 Chronicles 11:25; 2 Samuel 23:23.)

And in his course. —Hebrew, and his course. Ammizabad his son. Compare to the second clause of 1 Chronicles 27:4. Here, as there, the Septuagint and Vulgate give the sense “over his course,” as if Ammizabad were coadjutor with his father. The text may be defective in both places.