New Revised Standard Version
Above all, my beloved, do not swear, either by heaven or by earth or by any other oath, but let your “Yes” be yes and your “No” be no, so that you may not fall under condemnation.

Contemporary English Version
My friends, above all else, don't take an oath. You must not swear by heaven or by earth or by anything else. "Yes" or "No" is all you need to say. If you say anything more, you will be condemned.

New American Bible
But above all, my brothers, do not swear, either by heaven or by earth or with any other oath, but let your “Yes” mean “Yes” and your “No” mean “No,” that you may not incur condemnation.

Douay-Rheims Bible
But above all things, my brethren, swear not, neither by heaven, nor by the earth, nor by any other oath. But let your speech be: Yea, Yea: No, No: that you fall not under judgment.

But above all things, my brethren, swear not, neither by heaven, nor by the earth, nor by any other oath. But let your speech be: Yea, Yea: No, No: that you fall not under judgment.

above.

1 Peter 4:8 But before all things have a constant mutual charity among yourselves: for charity covereth a multitude of sins.

3 John 1:2 Dearly beloved, concerning all things I make it my prayer that thou mayest proceed prosperously and fare well, as thy soul doth prosperously.

swear not.

Matthew 5:33-37 Again you have heard that it was said to them of old, thou shalt not forswear thyself: but thou shalt perform thy oaths to the Lord. . . .

Matthew 23:16-22 Woe to you, blind guides, that say, Whosoever shall swear by the temple, it is nothing; but he that shall swear by the gold of the temple is a debtor. . . .

but.

2 Corinthians 1:17-20 Whereas then I was thus minded, did I use lightness? Or, the things that I purpose, do I purpose according to the flesh, that there should be with me, It is, and It is not? . . .

lest.

James 3:1,2 Be ye not many masters, my brethren, knowing that you receive the greater judgment. . . .

1 Corinthians 11:34 If any man be hungry, let him eat at home; that you come not together unto judgment. And the rest I will set in order, when I come.