KJV: 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.
NASB: But above all, my brethren, do not swear, either by heaven or by earth or with any other oath; but your yes is to be yes, and your no, no, so that you may not fall under judgment.
KJV: For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment;
NASB: For if God did not spare angels when they sinned, but cast them into hell and committed them to pits of darkness, reserved for judgment;
KJV: But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
NASB: But by His word the present heavens and earth are being reserved for fire, kept for the day of judgment and destruction of ungodly men.