Where in the Bible does it say: “yes, yes; no, no”?

Jesus teaches that a believer’s word should be simple and truthful: “yes” means yes, and “no” means no. This principle applies not only to the prohibition of rash oaths, but also to all Christian honesty, transparency, and faithfulness in speech.

There are indeed passages in the Bible where it is stated almost verbatim: “let your word be: ‘Yes, yes’; ‘No, no.’” The most famous of these are the words of Jesus in the Sermon on the Mount and the exhortation of the apostle James. For a Christian, this is not just a catchy phrase, but a vital moral principle: God desires His people to speak sincerely, without deceit, exaggeration, or false assurances.

The Main Passage: The Words of Jesus

This is stated most directly in the Gospel of Matthew:

“Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil.” Matt 5:37

These words appear in the context of teaching about oaths. In Jesus’ day, people often reinforced their words with various pledges, as though the simple truth were no longer enough. Christ points to a higher way: a life of such integrity that people can trust your words without any oath. If a person walks in the truth, they do not need to embellish their speech with solemn formulas.

For an Adventist understanding, this is especially significant because faithfulness to God is revealed in everyday matters: how we speak, what we promise, and how we follow through on what we have said. Christian character is not built solely through grand spiritual events, but through ordinary truthfulness in daily communication.

A Similar Thought in the Epistle of James

The apostle James closely echoes this instruction:

“But above all, my brothers, do not swear, either by heaven or by earth or by any other oath, but let your ‘yes’ be yes and your ‘no’ be no, so that you may not fall under condemnation.” Jas 5:12

James is not merely forbidding careless oaths; he is addressing a deeper issue of the heart. Wherever there is a lack of inner integrity, the need for loud assurances arises. But God calls His children to a life where truth is natural and honesty is second nature.

In the light of the Gospel, this means that a Christian’s speech must be pure not only in form, but also in spirit. One may refrain from swearing oaths yet still speak evasively, manipulatively, or ambiguously. The biblical standard is higher: sincerity, simplicity, and accountability for every word.

The Broader Biblical Principle: Speaking the Truth

The theme of “yes, yes; no, no” is intertwined with the overarching biblical teaching on truth. The apostle Paul writes:

“Therefore, having put away falsehood, let each one of you speak the truth with his neighbor, for we are members one of another.” Eph 4:25

And in the Psalms, we find a description of the person who may abide with God:

“He who walks blamelessly and does what is right and speaks truth in his heart.” Ps 15:2

Thus, it is not merely about a speech technique, but about the condition of the heart. A person can utter the right words, but if there is deception in the heart, God sees it. Biblical truth begins on the inside. What is in the heart overflows through the lips.

Jesus also taught that people bear moral responsibility for their words. Our speech reflects our character. Therefore, the call to a simple “yes” and “no” is a call to a life free from duplicity.

What This Means in Practice Today

In today’s world, it is very easy to exaggerate, make hasty promises, or speak in ways that leave room to backtrack. But a Christian is called to be different. If they say they will do something—they do it. If they cannot—they honestly admit it. If they do not know something—they do not pretend to know. It is precisely this kind of straightforwardness that builds trust in the family, the church, at work, and in society.

For Adventists, this also carries an end-time spiritual dimension. God’s people are called to witness not only through doctrine, but through character. In an era of deception, relativism, and falsehood, there is immense power in simple truthfulness. When a believer’s word is reliable, it becomes a silent testimony to God’s truth.

Ellen White repeatedly emphasized that truthfulness is an essential part of Christian character and that no form of deception can be excused in the life of a follower of Christ. In her view, genuine religion is manifested in purity of motives and integrity of speech. This harmonizes beautifully with the biblical principle: God desires truth “in the inward being,” not merely on the surface.

Why Jesus Adds: “Anything more than this comes from evil”

This is a striking statement. Jesus shows that whatever goes beyond simple honesty often stems from a spirit of deceit. Not every additional explanation is a sin, but when a person is constantly compelled to back up their words with oaths, dramatic pledges, or manipulative phrasing, it points to an underlying problem. The evil one loves to cloud the truth, whereas Christ leads us into clarity.

Therefore, the biblical “yes, yes; no, no” serves as a safeguard against hypocrisy. It teaches us to speak in a way that never misleads others. It also cures the heart of the habit of self-flattery through words.

Conclusion

So, if you are searching for the verse about “let your word be: ‘Yes, yes’; ‘No, no,’” look first to Matthew 5:37 and James 5:12. These are supported by other passages on truth, integrity, and a pure heart, such as Ephesians 4:25 and Psalm 15:2. The biblical message of these words is clear: God wants His children to be people of truth who can be trusted without needless oaths or loud assurances.

The practical application is simple: before making a promise, pause; speak only what is true; avoid exaggerations; admit mistakes straightforwardly; let your word be so honest that others can see in it a reflection of the character of Christ.