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 5:14

5:14 The Israelite foremen whom Pharaoh’s slave masters had set over them were beaten and were asked, “Why did you not complete your requirement for brickmaking as in the past – both yesterday and today?”