Charles Ellicott Commentary 1 Chronicles 10:4

"Then said Saul unto his armor-bearer, Draw thy sword, and thrust me through therewith, lest these uncircumcised come and abuse me. But his armor-bearer would not; for he was sore afraid. Therefore Saul took his sword, and fell upon it." — 1 Chronicles 10:4 (ASV)

And Saul said. —So Abimelech (Judges 9:54).

Lest these uncircumcised come. —The account in Samuel adds, “and thrust me through.” An inadvertent repetition in that account, or an omission in this passage, is possible. Or, we might say, Saul preferred death by a friendly stroke to the thrusts of insulting enemies.

And abuse me. —The Hebrew strictly means “to make a toy of” or “to sport with.” For example, How I have made a toy of Egypt (Exodus 10:2); and it is used of insulting a fallen enemy, as in this case (Jeremiah 38:19).

Took a sword. —Literally, the sword—i.e., his sword.