כְּחִצִּ֥ים בְּיַד־גִּבּ֑וֹר כֵּ֝֗ן בְּנֵ֣י הַנְּעוּרִֽים׃
Wie Pfeile in des Kriegers Hand, also die Söhne der Jugend.
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.