Rashi on I Chronicles
the head of the mighty men רֹאשׁ הַשָּׁלִישִׁים like (Exod. 14:7): “and mighty men וְשָׁלִשִׁים over them all.”
Rashi on I Chronicles
he stirred his spear When he was engaged in battle, he would not return from the battle until he had slain three hundred men with his spear.
Rashi on I Chronicles
the son of Hachmoni In Samuel (II 23:8), it is written: “Tahkemoni.” He is his father, and the father was stronger than the son, for it is written concerning him: “against eight hundred slain at one time.”