'Doest' in the Bible

and this rod thou dost take in thy hand, with which thou doest the signs.'

And when Moses' father in law saw all that he did to the people, he said, What is this thing that thou doest to the people? why sittest thou thyself alone, and all the people stand by thee from morning unto even?

And Moses' father in law said unto him, The thing that thou doest is not good.