'Nay' in the Bible

Nay, some one will say, "You have faith, I have actions: prove to me your faith apart from corresponding actions and I will prove mine to you by my actions.

But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.