'Nay' in the Bible

When I therefore was thus minded, did I show fickleness? or the things that I purpose, do I purpose according to the flesh, that with me there should be the yea yea and the nay nay?

But as God is faithful, our word toward you is not yea and nay.

For the Son of God, Jesus Christ, who was preached among you by us, even by me and Silvanus and Timothy, was not yea and nay, but in him is yea.

But though I be rude in speech, yet am I not in knowledge; nay, in every way have we made this manifest unto you in all things.