Exodus 9:2

For if thou refuse to let them go, and shalt retain them still,

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

And I say to thee, Let my son go, that he may serve me. And if thou refuse to let him go, behold, I will kill thy son, thy firstborn.

For, if thou refuse to let my people go, behold, I will to-morrow bring locusts into thy borders;

But if ye hearken not unto me, and do not all these commandments,

And if ye will not be disciplined by me through these, but walk contrary unto me,

And if for this ye hearken not to me, but walk contrary unto me,

God is a righteous judge, and a God who is indignant all the day.

Verily God will smite the head of his enemies, the hairy scalp of him that goeth on still in his trespasses.

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

But to those that are contentious, and are disobedient to the truth, but obey unrighteousness, there shall be wrath and indignation,

And I gave her time that she should repent, and she will not repent of her fornication.

And the men were burnt with great heat, and blasphemed the name of God, who had authority over these plagues, and did not repent to give him glory.

Treasury of Scripture Knowledge

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