Israelites. Some codices, with Samaritan Pentateuch, The Targum of Jonathan ben Uzziel, and Septuagint, read "sons of Israel".
hardened. See note on Exodus 4:2.
Related Commentaries of Exodus 9:7
Exodus 9:7
7 And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go.