Exodus 8:2

And if thou refuse to let them go, behold, I will smite all thy borders with frogs:
— Exodus 8:2, King James Version

In other translations

World English Bible (WEB)

If you refuse to let them go, behold, I will plague all your borders with frogs:

American Standard Version (ASV)

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

Young's Literal Translation (YLT)

and if thou art refusing to send away, lo, I am smiting all thy border with frogs;