Passage cross-references.

But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said.

And the LORD said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him:

But the LORD hardened Pharaoh’s heart, so that he would not let the children of Israel go.

But the LORD hardened Pharaoh’s heart, and he would not let them go.

And 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.

And if thou refuse to let them go, behold, I will smite all thy borders with frogs:

For if thou refuse to let them go, and wilt hold them still,

Else, if thou refuse to let my people go, behold, to morrow will I bring the locusts into thy coast:

But if ye refuse and rebel, ye shall be devoured with the sword: for the mouth of the LORD hath spoken it.

Why then is this people of Jerusalem slidden back by a perpetual backsliding? they hold fast deceit, they refuse to return.

Thine habitation is in the midst of deceit; through deceit they refuse to know me, saith the LORD.

Yea, they made their hearts as an adamant stone, lest they should hear the law, and the words which the LORD of hosts hath sent in his spirit by the former prophets: therefore came a great wrath from the LORD of hosts.

See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven: