22And thou shalt say unto Pharaoh, Thus saith the LORD, Israel is my son, even my firstborn:
23And I say unto thee, Let my son go, that he may serve me: and if thou refuse to let him go, behold, I will slay thy son, even thy firstborn.
12And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.
13And the LORD said unto Moses, Rise up early in the morning, and stand before Pharaoh, and say unto him, Thus saith the LORD God of the Hebrews, Let my people go, that they may serve me.
14For I will at this time send all my plagues upon thine heart, and upon thy servants, and upon thy people; that thou mayest know that there is none like me in all the earth.
15For now I will stretch out my hand, that I may smite thee and thy people with pestilence; and thou shalt be cut off from the earth.
16And in very deed for this cause have I raised thee up, for to shew in thee my power; and that my name may be declared throughout all the earth.
17As yet exaltest thou thyself against my people, that thou wilt not let them go?
33And Moses went out of the city from Pharaoh, and spread abroad his hands unto the LORD: and the thunders and hail ceased, and the rain was not poured upon the earth.
34And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants.
35And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.