Parallel
Exodus 8:2
Swete's Septuagint · Berean Standard Bible
εἰ δὲ μὴ βούλει σὺ ἐξαποατεῖλαι, ἰδοὺ τύπτω πάντα τὰ ὅριά σου τοῖς βατράχοις.
But if you refuse to let them go, I will plague your whole country with frogs.