James 5:12

But above all things, my brethren, swear not: neither by heaven, neither by earth, neither by any other oath. Let your yea be "yea," and your nay, "nay," lest ye fall into hypocrisy.

Matthew 5:33-37

"Again, ye have heard how it was said to them of old time, 'Thou shalt not forswear thyself, but shalt perform thine oath to God':

Matthew 23:16-22

Woe be unto you, blind guides, for ye which say, 'Whosoever swear by the temple, it is nothing: but whosoever swear by the gold of the temple, he offendeth.'

1 Corinthians 11:34

If any man hunger, let him eat at home, that ye come not together unto condemnation. Other things will I set in order when I come.

2 Corinthians 1:17-20

When I thus wise was minded: Did I use lightness? Or think I carnally those things which I think, that with me should be "yea, yea," and "nay, nay?"

James 3:1-2

My brethren, be not every man a master; Remembering how that we shall receive the more damnation.

1 Peter 4:8

But above all things, have fervent love among you. For love covereth the multitude of sins.

3 John 1:2

Wellbeloved, I wish in all things that thou prosperedest and faredest well, even as thy soul prospereth.

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 above all things, have fervent love among you. For love covereth the multitude of sins.
3 John 1:2
Wellbeloved, I wish in all things that thou prosperedest and faredest well, even as thy soul prospereth.

Swear not

Matthew 5:33
"Again, ye have heard how it was said to them of old time, 'Thou shalt not forswear thyself, but shalt perform thine oath to God':
Matthew 23:16
Woe be unto you, blind guides, for ye which say, 'Whosoever swear by the temple, it is nothing: but whosoever swear by the gold of the temple, he offendeth.'

But

2 Corinthians 1:17
When I thus wise was minded: Did I use lightness? Or think I carnally those things which I think, that with me should be "yea, yea," and "nay, nay?"

Lest

James 3:1
My brethren, be not every man a master; Remembering how that we shall receive the more damnation.
1 Corinthians 11:34
If any man hunger, let him eat at home, that ye come not together unto condemnation. Other things will I set in order when I come.

General references

Deuteronomy 5:11
'Thou shalt not take the name of the LORD thy God in vain: for the LORD will not hold him guiltless, that taketh his name in vain.