Your right hand, Hashem, is adorned with power, Your right hand, Hashem, smashes the enemy.
Your right hand is written two times. When Bnai Yisrael serves Hashem properly, then the left hand (which is intended for punnishment) becomes a right hand (which bestows reward). Through the good a person does he is able to avert punnishment and bring good in its place. How great is Hashem! It is impossible for a human being to do two actions at the same time with one hand. Only Hashem can do this. Hashem used His "right" hand to save Bnai Yisrael and at the same time, with the same "right hand", but with an entirely different action, destroyed the enemy. (Rashi)
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