Matthew 5:37

³⁵ Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.

³⁶ Neither shalt thou swear by thy head, because thou canst not make one hair white or black.

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

³⁸ Ye have heard that it hath been said, An eye for an eye, and a tooth for a tooth:

³⁹ But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Simply let your ‘Yes’ be ‘Yes,’ and your ‘No,’ ‘No.’ Anything more comes from the evil one.
KJV: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
WEB: But let your ‘Yes’ be ‘Yes’ and your ‘No’ be ‘No.’ Whatever is more than these is of the evil one.
ASV: But let your speech be, Yea, yea; Nay, nay: and whatsoever is more than these is of the evil [one].
DARBY: But let your word be Yea, yea; Nay, nay; but what is more than these is from evil.
BLB: But let your⁺ word ‘Yes’ be ‘Yes,’ [and] ‘No,’ ‘No.’ And that which [is] more than these comes from the evil one.

ÅB: Men la ja være ja, og nei vere nei; det som er mer enn dette er av det onde.
OTB: La deres ord være: ‘Ja, ja’ eller ‘Nei, nei’; alt utover dette er fra den onde.
B1930: Men eders tale skal være ja, ja, nei, nei; det som er mere enn dette, er av det onde.

James 5:12
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.
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Colossians 4:6
Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.
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Colossians 3:9
Lie not one to another, seeing that ye have put off the old man with his deeds;
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2 Corinthians 1:17–20
When I therefore was thus minded, did I use lightness? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea yea, and nay nay?
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John 8:44
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
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Ephesians 4:25
Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.
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2 Thessalonians 3:3
But the Lord is faithful, who shall stablish you, and keep you from evil.
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Matthew 13:19
When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.
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