Sforno on Exodus 15:6/ספורנו על שמות ט״ו:ו׳

1ימינך ה' נאדרי בכח, Moses emphasises that it is not the mighty military machine of Pharaoh which glorifies in power but the right hand of the Lord; (this was already the second “war” against the Egyptians G’d conducted, i.e. a separate war against part of the power of Egypt). The first time Moses mentioned G’d’s ימין this is a grateful acknowledgment of G’d’s war against Pharaoh; the repetition of the words

2'ימינך ה are a prayer for G’d to manifest this power against evil again at the time of the final redemption, may it come about soon in our days. We find a similar repetition in Devorah’s song of thanksgiving for Barak’s victory against Siserah in Judges 5,31.