'Mayest' in the Bible

I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.

and I heard a voice in the midst of the four living creatures saying, 'A measure of wheat for a denary, and three measures of barley for a denary,' and 'The oil and the wine thou mayest not injure.'

and when the seven thunders spake their voices, I was about to write, and I heard a voice out of the heaven saying to me, 'Seal the things that the seven thunders spake,' and, 'Thou mayest not write these things.'

and the court that is without the sanctuary leave out, and thou mayest not measure it, because it was given to the nations, and the holy city they shall tread down forty-two months;

And the fruits of the desire of thy soul did go away from thee, and all things -- the dainty and the bright -- did go away from thee, and no more at all mayest thou find them.

And he saith to me, 'Thou mayest not seal the words of the prophecy of this scroll, because the time is nigh;