James 5:12

Above all things, my brethren, don't swear, neither by the heaven, nor by the earth, nor use any other oath; but let your affirmation, or negation, be sincere, lest you fall under condemnation.

Matthew 5:33-37

Again, ye have heard that it hath been said to the antients, "Thou shalt not for swear thy self, but shalt perform unto the Lord thine oaths."

Matthew 23:16-22

wo unto you, ye blind guides, who say, if any man swear by the temple he is under no obligation: but if he swear by the gold of the temple, he is bound by his oath.

1 Corinthians 11:34

and if any one is press'd with hunger, let him eat at home; that ye may not otherwise meet with punishment. as for other matters, I will set them in order when I come.

2 Corinthians 1:17-20

was this design therefore the effect of levity? or do I design first one thing, and then another, as it best suits my worldly interest?

James 3:1-2

My brethren, don't affect many of you to be doctors, considering, that those of us who are such, shall be tried with the greater severity.

1 Peter 4:8

but above all, let your mutual benevolence be intense, for benevolence cancels a multitude of offences.

3 John 1:2

I wish, my beloved, you may be as prosperous with regard to your health and other circumstances, as in what concerns your soul.

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, let your mutual benevolence be intense, for benevolence cancels a multitude of offences.
3 John 1:2
I wish, my beloved, you may be as prosperous with regard to your health and other circumstances, as in what concerns your soul.

Swear not

Matthew 5:33
Again, ye have heard that it hath been said to the antients, "Thou shalt not for swear thy self, but shalt perform unto the Lord thine oaths."
Matthew 23:16
wo unto you, ye blind guides, who say, if any man swear by the temple he is under no obligation: but if he swear by the gold of the temple, he is bound by his oath.

But

2 Corinthians 1:17
was this design therefore the effect of levity? or do I design first one thing, and then another, as it best suits my worldly interest?

Lest

James 3:1
My brethren, don't affect many of you to be doctors, considering, that those of us who are such, shall be tried with the greater severity.
1 Corinthians 11:34
and if any one is press'd with hunger, let him eat at home; that ye may not otherwise meet with punishment. as for other matters, I will set them in order when I come.