James 5:12

But above all things, my brethren, swear not, either by heaven, or by the earth, or with any other oath: but let your yes, be yes, and your no, be no, lest you fall into condemnation.

Matthew 5:33-37

Again, you have heard that it was said to the ancients: You shall not swear falsely, but shall pay to the Lord your vows.

Matthew 23:16-22

Alas for you, blind guides! who say, Whoever shall swear by the temple, it is nothing; but whoever shall swear by the gold of the temple, becomes a debtor.

1 Corinthians 11:34

and if any one is hungry, let him eat at home, that you come not together for condemnation. But other things I will set in order when I come.

2 Corinthians 1:17-20

In forming this purpose, did I, therefore, behave with levity? or do I purpose what I purpose, according to the flesh, that there may be with me, yes yes, and no, no?

James 3:1-2

My brethren, be not many teachers, knowing that we shall receive the greater condemnation.

1 Peter 4:8

But, above all things, have fervent love one for another; for love will cover a multitude of sins.

3 John 1:2

Beloved, I pray 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.

Bible References

Above

1 Peter 4:8
But, above all things, have fervent love one for another; for love will cover a multitude of sins.
3 John 1:2
Beloved, I pray 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 was said to the ancients: You shall not swear falsely, but shall pay to the Lord your vows.
Matthew 23:16
Alas for you, blind guides! who say, Whoever shall swear by the temple, it is nothing; but whoever shall swear by the gold of the temple, becomes a debtor.

But

2 Corinthians 1:17
In forming this purpose, did I, therefore, behave with levity? or do I purpose what I purpose, according to the flesh, that there may be with me, yes yes, and no, no?

Lest

James 3:1
My brethren, be not many teachers, knowing that we shall receive the greater condemnation.
1 Corinthians 11:34
and if any one is hungry, let him eat at home, that you come not together for condemnation. But other things I will set in order when I come.