Exodus 4:10

4:10 Then Moses said to the Lord, “O my Lord, I am not an eloquent man, neither in the past nor since you have spoken to your servant, for I am slow of speech and slow of tongue.”

Exodus 4:23

4:23 and I said to you, ‘Let my son go that he may serve me,’ but since you have refused to let him go, I will surely kill your son, your firstborn!”’”

Exodus 9:24

9:24 Hail fell and fire mingled with the hail; the hail was so severe that there had not been any like it in all the land of Egypt since it had become a nation.