So I say to you, ‘Let My son go so that he may serve Me’; and if you refuse to let him go, behold, I will kill your son, your firstborn.”’”

However, if you refuse to let them go, hear this: I am going to strike your entire land with frogs.

But if you refuse to let them go and continue to hold them,

So Moses and Aaron went to Pharaoh and said to him, “Thus says the Lord, the God of the Hebrews: ‘How long will you refuse to humble yourself before Me? Let My people go, so that they may serve Me.

For if you refuse to let My people go, then hear this: tomorrow I will bring [migratory] locusts into your country.

Then the Lord said to Moses, “How long do you [people] refuse to keep My commandments and My instructions (laws)?