John Gill 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)

(See Gill on 1 Samuel 31:4)