'Mayest' in the Bible

And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.

Commanding his accusers to come unto thee: by examining of whom thyself mayest take knowledge of all these things, whereof we accuse him.

Because that thou mayest understand, that there are yet but twelve days since I went up to Jerusalem for to worship.