Exodus 9:16-21

But, indeed, for this reason I have allowed you to remain, in order to show you My power and in order to proclaim My name through all the earth. Still you exalt yourself against My people by not letting them go. Behold, about this time tomorrow, I will send a very heavy hail, such as has not been seen in Egypt from the day it was founded until now. Now therefore send, bring your livestock and whatever you have in the field to safety. Every man and beast that is found in the field and is not brought home, when the hail comes down on them, will die.” ’ ” The one among the servants of Pharaoh who feared the word of the LORD made his servants and his livestock flee into the houses; but he who paid no regard to the word of the LORD left his servants and his livestock in the field.