1 Samuel 31:4-5

4Then Saul said to his armor-bearer, "Draw your sword, and thrust me through with it, lest these uncircumcised come and thrust me through, and mistreat me." But his armor-bearer would not, for he feared greatly. Therefore Saul took his own sword and fell upon it.

5And when his armor-bearer saw that Saul was dead, he also fell upon his sword and died with him.