1 Samuel 31:5

And when his armourbearer saw that Saul was dead,.... By his own hands, and not by the hands of the Amalekite, which the armour bearer would scarcely have suffered:

he fell likewise upon his sword, and died with him; some think that Saul, and his armourbearer, died by the same sword, which was the armourbearer's; and if he was Doeg, they fell probably by the same sword with which the priests of the Lord were murdered at Nob, 1 Samuel 22:18; and it is observed by an historian d, that the murderers of Julius Caesar slew themselves with the same dagger they destroyed him.

d Sucton. Vit. Caesar. c. 89.