Matthew 5:37

but let your communication be, yes, yes; no, no: for whatever goes beyond this, is evil.

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 13:19

when any one heareth the doctrine of the gospel, and considers it not, then comes the wicked one, and catches away what was sown in his heart: he is the person meant by the high-way, where some of the seed was sown: but the stony ground,

Matthew 13:38

the field is the world: the good seed are the children of the kingdom: but the tares are the children of the wicked one:

Matthew 15:19

out of the heart proceed evil designs, murders, adulteries, fornications, thefts, false testimony, slanders.

John 8:44

you, who have the devil for your father, will execute the designs of your father: he was a murderer from the beginning, and deserted the truth, since he has no love for the truth: when he lyes, he speaks like himself: for he is a lyar, and the father of a lyar.

John 17:15

I do not pray you to take them out of the world, but to keep them from the malignity of it.

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?

Ephesians 4:25

Wherefore leave off the practice of lying, and let every man speak truth to his neighbour: for we are all members of one society.

Colossians 3:9

let there be no fraud among you, since you have discarded your former habits and practices, and are become new men,

Colossians 4:6

let an air of modesty appear in all your discourse; and let it be seasoned with discretion, in making a proper reply, when you are call'd into question.

2 Thessalonians 3:3

but as for you, the Lord, who is faithful, will establish you, and protect you from the malicious one.

1 John 2:13

I write to you, fathers, because ye have known him that is from the beginning. I write to you, young men, because you have overcome the wicked spirit. I write to you, little children, because ye have known the father.

1 John 3:12

not acting like Cain, who was of that wicked one, and slew his brother: but why did he slay him? because his own actions were evil, and his brother's were virtuous.

1 John 5:18

we know that a true christian will not commit such a sin, for he that is the child of God keeps upon his guard, so that the wicked spirit does not approach him.

Matthew 6:13

and let us not be left under temptation, but deliver us from the evil one."

Treasury of Scripture Knowledge

Summary

But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.

Bible References

Let

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?
Colossians 4:6
let an air of modesty appear in all your discourse; and let it be seasoned with discretion, in making a proper reply, when you are call'd into question.
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.

Cometh

Matthew 13:19
when any one heareth the doctrine of the gospel, and considers it not, then comes the wicked one, and catches away what was sown in his heart: he is the person meant by the high-way, where some of the seed was sown: but the stony ground,
Matthew 15:19
out of the heart proceed evil designs, murders, adulteries, fornications, thefts, false testimony, slanders.
John 8:44
you, who have the devil for your father, will execute the designs of your father: he was a murderer from the beginning, and deserted the truth, since he has no love for the truth: when he lyes, he speaks like himself: for he is a lyar, and the father of a lyar.
Ephesians 4:25
Wherefore leave off the practice of lying, and let every man speak truth to his neighbour: for we are all members of one society.
Colossians 3:9
let there be no fraud among you, since you have discarded your former habits and practices, and are become new men,
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.