It says in the Parasha of Beshallah, "Wayyar Yisrael eth Misrayim Meth al Sefath Hayyam", "And Israel saw the Egyptians dead on the sea shore". The next Pasuq says, "Wayyar Yisrael eth Hayyad Haggedolah Asher Asah H' BeMisrayim", "And Israel saw the Great Hand that G-d did over Egypt".
In 'Od Yoseph Hai Derashoth it says, that our Rabbi's of Blessed memory tell us that if a miracle was preformed for someone, he must thank G-d not just for that one miracle, but for all the miracles that Haqqadosh Barukh Hu, The Holy Blessed One Blessed Be He, has ever done for him.
The first miracle that was wrought for the Jewish people in Egypt, was when Moshe Rabbenu a"h (Moses) was placed by Yochebed in the Tebah in the bullrushes and instead of being drowned he was saved by the daughter of Pharaoh, whose hand became elongated. She was therefore able to pull him close to her from a distance, and see that he was a baby of the Israelites, have mercy on him, and bring him up if the palace, and eventually he would be the savior of Israel. The final miracle that G-d preformed for Bene Yisrael (the Children of Israel) in Egypt, was the miracle of the Red Sea, when they saw the Egyptians dead at the sea.
So the first Pasuq tells us, that the Jewish people saw with their own eyes the miracle of the Egyptians who were dead on the sea shore and the second Pasuq tells us that they saw in their minds the great hand, meaning the elongated arm of Bathya the Daughter of Pharoah, and praised G-d through the singing of the Shirath Hayyam.
(See 'Od Yoseph Hai Derashoth, Parashath Beshallah)
