James 5:12

But above everything else, my brothers, do not take oaths, not "by the heaven," nor "by the earth," nor by any other oath. But your "yes" should be [simply] "yes," and your "no," [simply] "no," so you do not fall under condemnation.

Matthew 5:33-37

"Again, you have heard what was said to people in time's past [Lev. 19:12], 'You must not go back on your oaths, but [rather] fulfill the oaths you take to the Lord.'

Matthew 23:16-22

"It is too bad for you blind leaders who say that whoever takes an oath 'by the Temple,' it does not [really] mean anything, but whoever takes an oath 'by the gold of the Temple,' he is obligated to [fulfill] the oath.

1 Corinthians 11:34

If anyone is [too] hungry [i.e., to wait], he should eat at home, so that your assembly does not result in judgment [falling on some of you. See verse 30]. And I will tend to the remaining matters when I come [to you].

2 Corinthians 1:17-20

So, when I made this decision, was I just vacillating [in uncertainty]? Or, do I make plans in a worldly way [i.e., just to suit my own fancy], so that my "yes" and "no" [do not really mean anything]?

James 3:1-2

Not many of you should be teachers, my brothers, because you [should] know that we [teachers] will be judged more strictly.

1 Peter 4:8

Above everything else, have a warm love for one another, for such a love keeps many sins from occurring [between you].

3 John 1:2

[My] dearly loved [friend], I am praying that you will do well in everything [materially ?] and that you will have [good] health, just as your soul [i.e., your spiritual life] is doing well.

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
Above everything else, have a warm love for one another, for such a love keeps many sins from occurring [between you].
3 John 1:2
[My] dearly loved [friend], I am praying that you will do well in everything [materially ?] and that you will have [good] health, just as your soul [i.e., your spiritual life] is doing well.

Swear not

Matthew 5:33
"Again, you have heard what was said to people in time's past [Lev. 19:12], 'You must not go back on your oaths, but [rather] fulfill the oaths you take to the Lord.'
Matthew 23:16
"It is too bad for you blind leaders who say that whoever takes an oath 'by the Temple,' it does not [really] mean anything, but whoever takes an oath 'by the gold of the Temple,' he is obligated to [fulfill] the oath.

But

2 Corinthians 1:17
So, when I made this decision, was I just vacillating [in uncertainty]? Or, do I make plans in a worldly way [i.e., just to suit my own fancy], so that my "yes" and "no" [do not really mean anything]?

Lest

James 3:1
Not many of you should be teachers, my brothers, because you [should] know that we [teachers] will be judged more strictly.
1 Corinthians 11:34
If anyone is [too] hungry [i.e., to wait], he should eat at home, so that your assembly does not result in judgment [falling on some of you. See verse 30]. And I will tend to the remaining matters when I come [to you].