Matthew 5:37

But let your language be, Yea, yea; Nay; nay; for whatever is more than these cometh of evil.

James 5:12

But above all things, my brethren, swear not; neither by heaven, nor by the earth, nor by any other oath; but let your yea be yea, and your nay, nay; that ye fall not under condemnation.

Matthew 13:19

When any one heareth the word of the kingdom, and understandeth it not, the Evil One cometh, and snatcheth away that which was sown in his heart; this man is what was sown by the wayside.

Matthew 13:38

The field is the world; the good seed is the sons of the kingdom; but the tares are the sons of the Evil One;

Matthew 15:19

For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimony, blasphemies.

John 8:44

Ye are of your father the Devil, and what your father desireth ye are ready to do. He was a murderer from the beginning; and he abideth not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh from his own nature; for he is a liar, and the father of it.

John 17:15

I do not pray thee to take them out of the world, but to keep them from evil.

2 Corinthians 1:17-20

Having, then, this purpose, did I act with levity? Or in my purposes do I resolve according to the flesh, that with me there should be now yea, yea, and now nay, nay?

Ephesians 4:25

Wherefore having put away falsehood, speak truth every one with his neighbor; for we are members one of another.

Colossians 3:9

Lie not one to another, seeing that ye have put off the old man with his deeds,

Colossians 4:6

Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every one.

2 Thessalonians 3:3

But faithful is the Lord, who will establish you, and guard you from evil.

1 John 2:13

I write to you, fathers, because ye know him that was from the beginning. I write to you, young men, because ye have overcome the Evil One. I have written to you, my children, because ye know the Father.

1 John 3:12

not as Cain was of the Evil One, and slew his brother. And wherefore did he slay him? Because his own works were evil, and his brothers righteous.

1 John 5:18

We know that whoever hath been born of God sinneth not; but he that is born of God keepeth himself, and the Evil One toucheth him not.

Matthew 6:13

and lead us not into temptation, but deliver us from evil.

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
Having, then, this purpose, did I act with levity? Or in my purposes do I resolve according to the flesh, that with me there should be now yea, yea, and now nay, nay?
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every one.
James 5:12
But above all things, my brethren, swear not; neither by heaven, nor by the earth, nor by any other oath; but let your yea be yea, and your nay, nay; that ye fall not under condemnation.

Cometh

Matthew 13:19
When any one heareth the word of the kingdom, and understandeth it not, the Evil One cometh, and snatcheth away that which was sown in his heart; this man is what was sown by the wayside.
Matthew 15:19
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimony, blasphemies.
John 8:44
Ye are of your father the Devil, and what your father desireth ye are ready to do. He was a murderer from the beginning; and he abideth not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh from his own nature; for he is a liar, and the father of it.
Ephesians 4:25
Wherefore having put away falsehood, speak truth every one with his neighbor; for we are members one of another.
Colossians 3:9
Lie not one to another, seeing that ye have put off the old man with his deeds,
James 5:12
But above all things, my brethren, swear not; neither by heaven, nor by the earth, nor by any other oath; but let your yea be yea, and your nay, nay; that ye fall not under condemnation.