'Impediment' in the Bible

Then Moses told the LORD, "Please, LORD, I'm not eloquent. I never was in the past nor am I now since you spoke to your servant. In fact, I talk too slowly and I have a speech impediment."

And they bring unto him one that was deaf, and had an impediment in his speech; and they beseech him to put his hand upon him.

And his ears were opened, and the impediment of his tongue was removed, and he began speaking plainly.