Exodus 9:18-21

18Therefore, at this time tomorrow I will send the worst hailstorm that has ever fallen on Egypt, from the day it was founded till now. 19Give an order now to bring your livestock and everything you have in the field to a place of shelter, because the hail will fall on every person and animal that has not been brought in and is still out in the field, and they will die.’ ” 20Those officials of Pharaoh who feared the word of the Lord hurried to bring their slaves and their livestock inside. 21But those who ignored the word of the Lord left their slaves and livestock in the field.