כְּחִצִּ֥ים בְּיַד־גִּבּ֑וֹר כֵּ֝֗ן בְּנֵ֣י הַנְּעוּרִֽים׃
젊은 자의 자식은 장사의 수중의 화살 같으니
Rashi on Psalms
Like arrows in the hand of a mighty man with which to battle his enemies.
Rashi on Psalms
so are the sons of one’s youth The disciples that a man sets up in his youth.