Charles Ellicott Commentary 1 Chronicles 10:2

"And the Philistines followed hard after Saul and after his sons; and the Philistines slew Jonathan, and Abinadab, and Malchi-shua, the sons of Saul." — 1 Chronicles 10:2 (ASV)

The Philistines followed hard after Saul. —Literally, clung to Saul, that is, hotly pursued him. (Compare to 1 Kings 22:31.) The destruction of the king and his sons would make their triumph complete.

The sons of Saul. —Omit the. Eshbaal, Saul’s fourth son, was not in the battle (2 Samuel 2:8; compare to 1 Chronicles 8:33). Like Zedekiah, the last king of Judah, Saul may have witnessed the death of his sons (2 Kings 25:7). Jonathan, at least, would not be far from him in the last struggle. In their deaths they were not divided.