They showed his signs among them
The Egyptians to whom they were sent; that is, Moses and Aaron did. In the original it is, "the words of his signs" F24. They declared the words of God to them, that he would do such signs and wonders among them; or inflict such plagues upon them, in case they did not let Israel go: or they performed them according to the word of the Lord, as he commanded them, as well as taught the doctrines and instructions to be learned from them. The Septuagint and Vulgate Latin versions render it in the singular number, though contrary to the Hebrew text, and understand it of God, "he put the words of his signs in them"; in Moses and Aaron; or gave them orders and power to perform them: he put them "in both", as the Arabic version has it; or, "he did his signs by them", as the Syriac version.
And wonders in the land of Ham;
or Egypt, as in ( Psalms 105:23 ) , meaning the miracles of the plagues, which are next particularly mentioned, though not all of them: the plagues of the murrain, and of the boils and blains, are omitted; the reason of which, according to Aben Ezra, is, because Pharaoh did not seek to Moses to remove them; and the other eight that are mentioned are not placed in the order in which they were done, the last but one being observed first.
F24 (wytwta yrbd) "verba signorum suorum", Pagninus, Montanus, Vatablus, Junius & Tremellius