James 5:12

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 you fall under judgment.

Matthew 5:33-37

Again, you have heard that it has been said by them of old time, You shall not perjure yourself, but shall perform unto the Lord your oaths:

Matthew 23:16-22

Woe unto you, 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 bound!

1 Corinthians 11:34

And if any man hunger, let him eat at home; that you come not together unto judgment. And the rest will I set in order when I come.

2 Corinthians 1:17-20

When I therefore was thus minded, did I use lightness? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea yea, and nay nay?

James 3:1-2

My brethren, be not many teachers, knowing that we shall receive the severer judgment.

1 Peter 4:8

And above all things have fervent love among yourselves: for love shall cover a multitude of sins.

3 John 1:2

Beloved, I wish above all things that you may prosper and be in health, even as your 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
And above all things have fervent love among yourselves: for love shall cover a multitude of sins.
3 John 1:2
Beloved, I wish above all things that you may prosper and be in health, even as your soul prospers.

Swear not

Matthew 5:33
Again, you have heard that it has been said by them of old time, You shall not perjure yourself, but shall perform unto the Lord your oaths:
Matthew 23:16
Woe unto you, 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 bound!

But

2 Corinthians 1:17
When I therefore was thus minded, did I use lightness? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea yea, and nay nay?

Lest

James 3:1
My brethren, be not many teachers, knowing that we shall receive the severer judgment.
1 Corinthians 11:34
And if any man hunger, let him eat at home; that you come not together unto judgment. And the rest will I set in order when I come.

General references

Deuteronomy 5:11
You shall not take the name of the LORD your God in vain: for the LORD will not hold him guiltless that takes his name in vain.