נְדִ֘יבֵ֤י עַמִּ֨ים ׀ נֶאֱסָ֗פוּ עַם֮ אֱלֹהֵ֪י אַבְרָ֫הָ֥ם כִּ֣י לֵֽ֭אלֹהִים מָֽגִנֵּי־אֶ֗רֶץ מְאֹ֣ד נַעֲלָֽה׃
The princes of the peoples are gathered together, the people of the God of Abraham; for unto God belong the shields of the earth; He is greatly exalted.
Rashi on Psalms
The volunteers of the peoples Who offered themselves to the slaughter, to be slain for the sanctity of His name.
Rashi on Psalms
the people of the God of Abraham who was the first volunteer, the first of the proselytes [he was the first to volunteer himself to proselytize]. Now it is known that God has the shields of the earth and He has the power to be a shield for all who trust in Him.