The Lord hath made bare his holy arm in the eyes of all the nations,.... Revealed his Gospel, which is a system of holy doctrines, and is the power of God unto salvation, openly, in the sight of all men, and given it a general spread all the world over; and with it has exerted his almighty power, in the marvellous conversion of multitudes of souls everywhere, in which his holiness, as well as his power, is displayed: or else Christ is here meant, who is the power of God; by whom he has made the world, and upholds it; by whom he has redeemed his people, and saved them; and by whom he keeps and preserves them; and by whom he will raise them from the dead at the last day; and who is holy in his nature, and in his works: this arm of his was made bare or revealed at his incarnation; is evidently seen in his word and ordinances; and will be more clearly revealed therein in the latter day, as he will be most fully manifested in person at the last day, even in the eyes of the whole world.
The allusion is to military persons preparing for battle, especially in the eastern countries, where they wore loose and long garments, which they tucked up on their arms, that they might be more expeditious in it, and so in any other service.
Scanderbeg used to fight the Turks with his arm bare, as the writer of his life observes.