Exodus 9:18-21 NIV

18 Therefore, at this time tomorrow I will send the worst hailstorm1 that has ever fallen on Egypt, from the day it was founded till now.2

References for Exodus 9:18

19 Give 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 man and animal that has not been brought in and is still out in the field, and they will die.' "
20 Those officials of Pharaoh who feared3 the word of the LORD hurried to bring their slaves and their livestock inside.

References for Exodus 9:20

21 But those who ignored4 the word of the LORD left their slaves and livestock in the field.

References for Exodus 9:21