Guarding God’s Name: Speech, Oaths, and Reverence

The third commandment speaks with plain force: do not make wrongful use of the name of the Lord, for the Lord will not acquit anyone who misuses his name. Jesus sharpens the point by taking aim at the mouth, where words are born. Let your word be yes, yes or no, no. Anything more than this comes from the evil one. Out of the abundance of the heart the mouth speaks. By your words you will be justified and by your words you will be condemned. The text ties the tongue to the heart and the heart to God’s own honor.

A hard lesson about names comes from a marketplace parable. A Cincinnati giant stripped a century-old moon-and-stars logo from its products rather than let rumors tie its name to darkness. That costly choice showed how much a name carries. A name is identity. A name is reputation. If people go to court to protect a logo, how much more does God guard the glory of his name.

God’s name in Scripture is not a label but God’s very character put within earshot. Israel reverenced the revealed name Yahweh and chose titles like the Holy One, Most High, El Shaddai, Adonai, Elohim. To praise God was to praise his name. To worship God was to call on his name. In Acts, the question comes straight: by what power or what name did you do this. The answer lands with weight. By the name of Jesus of Nazareth. God binds his reputation to his name, and he does not permit that reputation to be cheapened.

Profanity does not start with letters but with a posture. Profane means in front of the temple, where what is holy gets treated like common traffic. Webster calls it abusing the sacred. When a mouth tells God to damn, it is praying without fellowship. When speech drags bodies into the gutter, it profanes what God made as his temple. The trouble is not syllables but contempt.

The Hebrew sense of in vain means to take up for unreality. So any use of God’s name that is false, idle, frivolous, or insincere violates this command. Jesus exposes oath games designed to keep God out of deals. There is no way to keep God out. Let yes be yes. Let no be no. The trade in borrowed authority also shows up in God told me stamped on personal desires. That is forgery. It is identity theft. God’s gift of speech can exalt his name or stain it. The tree is known by its fruit, and the mouth tells the truth about the heart.

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Key Takeaways

• 1. God’s name reveals God’s character [28:31] God’s name is not a tag but God’s reputation at work in the world. To bless the name is to bless God, and to misuse the name is to misrepresent who God is. Treating the name lightly hollows out reverence and confuses the watching world about God’s holiness. Honor the name to honor the One who bears it. [28:31]
• 2. Profanity profanes what God made holy [31:49] Profanity starts in the heart that drags the sacred into the street. Words matter because they signal whether a person treats bodies, judgment, and God himself as weighty or disposable. Reverence disciplines the tongue, not out of fussiness, but out of love for what God calls his temple. Clean speech grows from a clean regard for holiness. [31:49]
• 3. Let your yes be yes [19:43] Jesus removes the verbal scaffolding of oaths because God already stands in every transaction. Truthful people do not need spiritual-sounding guarantees to be believed. Integrity makes the tongue simple and sturdy, so commitments do not wobble when convenience changes. Speak plainly and keep the promise your words make. [19:43]
• 4. Do not forge God’s signature [37:19] Saying God told me to rubber-stamp personal wishes is a kind of identity theft. Humility tests impressions against Scripture, the Spirit’s fruit, and wise counsel before invoking God’s name. False certainty can wound others and harden the heart to correction. Let God’s authority rest on what God has truly said. [37:19]
• 5. Words reveal hearts and face judgment [20:50] Speech is fruit, and fruit tells the tree’s story. Jesus ties the eternal verdict to ordinary words because words carry the heart’s cargo. Guarding the mouth becomes a way of guarding the springs of life within. Attend to the heart, and the tongue will begin to tell the truth beautifully. [20:50]

Youtube Chapters

• [00:00] - Welcome
• [18:29] - Third Commandment introduced
• [18:57] - Exodus 20:7 read
• [19:43] - Let your yes be yes
• [20:28] - Out of the heart, mouth speaks
• [21:05] - A corporate name under fire
• [22:45] - Choosing reputation over a logo
• [26:23] - The name Yahweh revered
• [27:51] - By what name did you act
• [28:31] - God’s name equals God’s character
• [31:10] - What profane really means
• [34:42] - In vain means unreality
• [36:16] - God present in every oath
• [37:05] - Forging God’s name today
• [38:51] - Speech as a gift for glory

Bible Reading
- Exodus 20:7 (ESV): “You shall not take the name of the Lord your God in vain, for the Lord will not hold him guiltless who takes his name in vain.”
- Matthew 5:33-37 (ESV): “Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’ But I say to you, Do not take an oath at all, either by heaven, for it is the throne of God, or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. And do not take an oath by your head, for you cannot make one hair white or black. Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil.”
- Matthew 12:34-37 (ESV): “For out of the abundance of the heart the mouth speaks. The good person out of his good treasure brings forth good, and the evil person out of his evil treasure brings forth evil. I tell you, on the day of judgment people will give account for every careless word they speak, for by your words you will be justified, and by your words you will be condemned.”

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Observation Questions

1. What specific consequence does Exodus 20:7 associate with misusing God’s name?
2. In Matthew 5:33-37, what does Jesus say about oaths and why does He emphasize “Let your yes be yes”?
3. How does Matthew 12:34-37 connect the words we speak to the condition of our hearts?
4. What example from the sermon illustrates the importance of protecting a name or reputation? [22:45]

Interpretation Questions

1. Why might God’s name be so closely tied to His character and reputation, as opposed to just being a label?
2. How does the concept of “profanity” go beyond vulgar language to include attitudes toward sacred things? [31:10]
3. What does Jesus’ teaching about oaths (Matthew 5:33-37) reveal about God’s presence in everyday interactions?
4. Why is claiming “God told me” to justify personal desires considered a form of “identity theft”? [37:19]

Application Questions

1. Reflect on your speech this past week: When have your words (even casually) treated something sacred as common or trivial? What would it look like to speak with more reverence?
2. Are there situations where you’ve used phrases like “I swear” or “I promise” to convince others of your honesty? How could you replace those habits with simple “yes” or “no” responses?
3. Have you ever attached God’s name to a personal opinion or desire (e.g., “God led me to do this”)? How can you test such impressions against Scripture or wise counsel? [37:59]
4. What practical step could you take this week to guard your heart so that your speech reflects integrity and honors God’s name?
5. The sermon mentions that “profanity starts in the heart” [31:49]. What attitudes or habits might be making your heart careless toward holiness, and how can you address them?
6. How would your conversations change if you truly believed you’d give an account for every careless word (Matthew 12:36)? Name one relationship where you need to speak more thoughtfully.