James 5:12

But before all things, my brethren, swear not, neither by heaven, nor by the earth, nor by any other oath; but let your yea be yea, and your nay, nay, that ye do not fall under judgment.

Matthew 5:33-37

Again, ye have heard that it has been said to the ancients, Thou shalt not forswear thyself, but shalt render to the Lord what thou hast sworn.

Matthew 23:16-22

Woe to you, blind guides, who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor.

1 Corinthians 11:34

If any one be hungry, let him eat at home, that ye may not come together for judgment. But the other things, whenever I come, I will set in order.

2 Corinthians 1:17-20

Having therefore this purpose, did I then use lightness? Or what I purpose, do I purpose according to flesh, that there should be with me yea yea, and nay nay?

James 3:1-2

Be not many teachers, my brethren, knowing that we shall receive greater judgment.

1 Peter 4:8

but before all things having fervent love among yourselves, because love covers a multitude of sins;

3 John 1:2

Beloved, I desire that in all things thou shouldest prosper and be in health, even as thy soul prospers.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

Above

1 Peter 4:8
but before all things having fervent love among yourselves, because love covers a multitude of sins;
3 John 1:2
Beloved, I desire that in all things thou shouldest prosper and be in health, even as thy soul prospers.

Swear not

Matthew 5:33
Again, ye have heard that it has been said to the ancients, Thou shalt not forswear thyself, but shalt render to the Lord what thou hast sworn.
Matthew 23:16
Woe to you, blind guides, who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor.

But

2 Corinthians 1:17
Having therefore this purpose, did I then use lightness? Or what I purpose, do I purpose according to flesh, that there should be with me yea yea, and nay nay?

Lest

James 3:1
Be not many teachers, my brethren, knowing that we shall receive greater judgment.
1 Corinthians 11:34
If any one be hungry, let him eat at home, that ye may not come together for judgment. But the other things, whenever I come, I will set in order.

General references

Deuteronomy 5:11
Thou shalt not idly utter the name of Jehovah thy God; for Jehovah will not hold him guiltless that idly uttereth his name.