Charles Ellicott Commentary 1 Chronicles 27:7

"The fourth [captain] for the fourth month was Asahel the brother of Joab, and Zebadiah his son after him: and in his course were twenty and four thousand." — 1 Chronicles 27:7 (ASV)

The fourth captain for the fourth month. —Hebrew: the fourth, for the fourth month; an abridged mode of expression, which is preserved from this point to the end of the list.

Asahel the brother of Joab. —1 Chronicles 11:26. Asahel was slain by Abner at the beginning of David’s reign (2 Samuel 2:18–23). The added clause, “And Zebadiah his son after him,” evidently refers to this fact. Perhaps the difficult statements about Mikloth and Ammizabad in 1 Chronicles 27:4; 1 Chronicles 27:6 were originally similar to this one about Zebadiah. The fourth division “may have been called by the name of the fallen hero in honour of his memory” (Bertheau).