And Jehovah said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I may show these my signs in the midst of them,

Yea, they made their hearts as an adamant stone, lest they should hear the law, and the words which Jehovah of hosts had sent by his Spirit by the former prophets: therefore there came great wrath from Jehovah of hosts.

He refuseth

and I have said unto thee, Let my son go, that he may serve me; and thou hast refused to let him go: behold, I will slay thy son, thy first-born.

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 locusts into thy border:

but if ye refuse and rebel, ye shall be devoured with the sword; for the mouth of Jehovah hath spoken it.

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

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

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

General references

And Pharaoh hardened his heart this time also, and he did not let the people go.

And Jehovah hardened the heart of Pharaoh, and he hearkened not unto them, as Jehovah had spoken unto Moses.

But Jehovah hardened Pharaoh's heart, and he did not let the children of Israel go.