Exodus 5:2
And Pharaoh said, Who is the LORD, that I should obey his voice to let Israel go? I know not the LORD, neither will I let Israel go.
Torrey's Topical Textbook—AKJV

Nehemiah 9:17
And refused to obey, neither were mindful of your wonders that you did among them; but hardened their necks, and in their rebellion appointed a captain to return to their bondage: but you are a God ready to pardon, gracious and merciful, slow to anger, and of great kindness, and forsook them not.
Torrey's Topical Textbook—AKJV