“That led them by the right hand of Moses with His glorious arm, dividing the water before them, to make Himself an everlasting name, Who led them through the deep,
As a horse in the wilderness, that they might not stumble?” – Isaiah 63:12

“The right hand of Moses,” by itself, was no more than your right hand or mine; but when God’s glorious arm worked by the right hand of Moses, the sea divided, and made a way for the hosts of Israel to pass over. As the Psalmist sings, “He divided the sea, and caused them to pass through; and He made the waters to stand as a heap.” The right hand of Moses could not have wrought that miracle; but the glorious arm of the Lord did…Then, there came to God’s people a very marvellous deliverance: “That led them through the deep, as a horse in the wilderness, that they should not stumble.” Understand by the word “wilderness” here, an expansive grassy plain; a place of wild grass and herbs, for so it means. And as a horse is led where it is flat and level, and he does not stumble, so were the hosts of Israel led through the Red Sea. The bottom of the sea may be stony or gravelly, or it may be full of mire and mud. Probably, there will be huge rocks standing up in the middle of the stream. There may be a sudden fall from one stratum of rock to the other; and to come up from the sea on the further bank would be hard work for struggling people carrying burdens, as these Israelites did; for they went out of Egypt harnessed and laden, bearing their kneading-troughs in their clothes upon their shoulders. But God made that rough sea bottom to be as easy travelling for them as when a horse is led across a flowery meadow. Beloved, God has done so with His church in all time. Her seas of difficulty have had no difficulty about them. He has come in all the glory of His power, and smoothed the way for the ransomed to pass over. Has it not been so with you, my brethren? ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2258.cfm