C.H. Spurgeons's The Treasury of David
Verse 27. They showed his signs among them, and wonders in the land of Ham. The miracles which were wrought by Moses were the Lord's, not his own: signs, as being the marks of Jehovah's presence hence they are here called "his" and power. The plagues were "words of his signs" (see margin), that is to say, they were speaking marvels, which testified more plainly than words to the omnipotence of Jehovah, to his determination to be obeyed, to his anger at the obstinacy of Pharaoh. Never were discourses more plain, pointed, personal, or powerful, and yet it took ten of them to accomplish the end designed. In the preaching of the gospel there are words, and signs, and wonders and these leave men without excuse for their impenitence; to have the kingdom of God come nigh unto them, and yet to remain rebellious is the unhappy sin of obstinate spirits. Those are wonders of sin who see wonders of grace, and yet are unaffected by them: bad as he was, Pharaoh had not this guilt, for the prodigies which lie beheld were marvels of judgment and not of mercy.