Exodus 9:12-14

Young's Literal Translation

¹² And Jehovah strengtheneth the heart of Pharaoh, and he hath not hearkened unto them, as Jehovah hath spoken unto Moses.

¹³ And Jehovah saith unto Moses, `Rise early in the morning, and station thyself before Pharaoh, and thou hast said unto him, Thus said Jehovah, God of the Hebrews, Send My people away, and they serve Me,

¹⁴ for, at this time I am sending all My plagues unto thy heart, and on thy servants, and on thy people, so that thou knowest that there is none like Me in all the earth,