James 5:12

But, my brethren, before all, swear not, neither by heaven, or by earth, or any other oath: but let your conversation be yes yes; and no no; lest you may fall under condemnation.

Matthew 5:33-37

Again you have heard that it was said to the ancients, Thou shalt not swear falsely, but shall perform unto the Lord thine oaths.

Matthew 23:16-22

Woe unto you, blind guides, who are saying, Whosoever may swear by the temple it is nothing; but whosoever may swear by the gold of the temple, he is debtor.

1 Corinthians 11:34

If one is hungry let him eat at home; in order that you may not come together unto condemnation. But I will set in order the remaining things when I may come.

2 Corinthians 1:17-20

Then wishing this, whether did I use lightness of purpose? or the things which I counsel, do I counsel according to the flesh, in order that it may be with me yes yes and no no?

James 3:1-2

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

1 Peter 4:8

before all things having divine love stedfast toward one another; because divine love covers a multitude of sins:

3 John 1:2

Beloved, I pray that you may prosper concerning all things and be well, 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.

Bible References

Above

1 Peter 4:8
before all things having divine love stedfast toward one another; because divine love covers a multitude of sins:
3 John 1:2
Beloved, I pray that you may prosper concerning all things and be well, as your soul prospers.

Swear not

Matthew 5:33
Again you have heard that it was said to the ancients, Thou shalt not swear falsely, but shall perform unto the Lord thine oaths.
Matthew 23:16
Woe unto you, blind guides, who are saying, Whosoever may swear by the temple it is nothing; but whosoever may swear by the gold of the temple, he is debtor.

But

2 Corinthians 1:17
Then wishing this, whether did I use lightness of purpose? or the things which I counsel, do I counsel according to the flesh, in order that it may be with me yes yes and no no?

Lest

James 3:1
Be ye not many teachers, my brethren, knowing that we shall receive the greater judgment.
1 Corinthians 11:34
If one is hungry let him eat at home; in order that you may not come together unto condemnation. But I will set in order the remaining things when I may come.