Bible Verses About Stammering

Moses said: I beseech thee, Lord, I am not eloquent from yesterday and the day before; and since thou hast spoken to thy servant, I have more impediment and slowness of tongue.

And the heart of fools shall understand knowledge, and the tongue of stammerers shall speak readily and plain.

The shameless people thou shalt not see, the people of profound speech: so that thou canst not understand the eloquence of his tongue, in whom there is no wisdom.