With a strong hand, and with a stretched out arm,.... Exerting his power in a very open manner, and continuing it till he had effected the work; bringing his people out of Egypt, which is always ascribed to his great strength and mighty power, Ex 13:3.
The redemption of the mystical Israel of God is by a mighty Redeemer, the Lord of hosts; who has redeemed them out of the hands of their enemies, that were stronger than they, and too strong for them: the conversion of them is by the power of the grace of God, even by the exceeding greatness of his power, and yet both acts of grace and mercy;for his mercy [endureth] for ever; it was mercy put the Lord on stretching out his arm, and showing the strength of his right hand, in delivering Israel out of Egypt; and in his love and in his pity he redeemed them, Isa 63:9.