The Bible has a HUGE amount to say about guarding our tongues. I would assume that includes swear words, of all types, because they are not God honouring!
So, I went looking for a verse in James and found all of the following. The Bible says a lot about our speech and tongue, and how cursing is not from God. And if it is from the devil, why would you want to curse?
Proverbs 21:23
Whoever keeps his mouth and his tongue keeps himself out of trouble.
Ephesians 4:29
Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear.
Proverbs 15:1 ESV
A soft answer turns away wrath, but a harsh word stirs up anger.
Proverbs 12:18 ESV
There is one whose rash words are like sword thrusts, but the tongue of the wise brings healing.
James 3:2-10 ESV
For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body. If we put bits into the mouths of horses so that they obey us, we guide their whole bodies as well. Look at the ships also: though they are so large and are driven by strong winds, they are guided by a very small rudder wherever the will of the pilot directs. So also the tongue is a small member, yet it boasts of great things. How great a forest is set ablaze by such a small fire! And the tongue is a fire, a world of unrighteousness. The tongue is set among our members, staining the whole body, setting on fire the entire course of life, and set on fire by hell.
Psalm 34:13 ESV
Keep your tongue from evil and your lips from speaking deceit.
James 1:26 ESV
If anyone thinks he is religious and does not bridle his tongue but deceives his heart, this person's religion is worthless.
Proverbs 17:28 ESV
Even a fool who keeps silent is considered wise; when he closes his lips, he is deemed intelligent.
Psalm 141:3 ESV
Set a guard, O Lord, over my mouth; keep watch over the door of my lips!
1 Peter 3:10 ESV
For “Whoever desires to love life and see good days, let him keep his tongue from evil and his lips from speaking deceit;
Proverbs 18:21 ESV
Death and life are in the power of the tongue, and those who love it will eat its fruits.
Proverbs 15:4 ESV
A gentle tongue is a tree of life, but perverseness in it breaks the spirit
Matthew 12:33-37
“
Either make the tree good and its fruit good, or make the tree bad and its fruit bad, for the tree is known by its fruit. You brood of vipers! How can you speak good, when you are evil? 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.”
James 3:10 ESV
From the same mouth come blessing and cursing. My brothers, these things ought not to be so.
Matthew 15:11 ESV
It is not what goes into the mouth that defiles a person, but what comes out of the mouth; this defiles a person.”
Proverbs 10:19 ESV
When words are many, transgression is not lacking, but whoever restrains his lips is prudent.
James 3:1-18 ESV
Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness. For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body. If we put bits into the mouths of horses so that they obey us, we guide their whole bodies as well. Look at the ships also: though they are so large and are driven by strong winds, they are guided by a very small rudder wherever the will of the pilot directs. So also the tongue is a small member, yet it boasts of great things. How great a forest is set ablaze by such a small fire!
Psalm 37:30 ESV
The mouth of the righteous utters wisdom, and his tongue speaks justice.
Ecclesiastes 3:7 ESV
A time to tear, and a time to sew; a time to keep silence, and a time to speak;
Psalm 39:1 ESV
To the choirmaster: to Jeduthun. A Psalm of David. I said, “I will guard my ways, that I may not sin with my tongue; I will guard my mouth with a muzzle, so long as the wicked are in my presence.”
James 4:1-17 ESV
What causes quarrels and what causes fights among you? Is it not this, that your passions are at war within you? You desire and do not have, so you murder. You covet and cannot obtain, so you fight and quarrel. You do not have, because you do not ask. You ask and do not receive, because you ask wrongly, to spend it on your passions. You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God. Or do you suppose it is to no purpose that the Scripture says, “He yearns jealously over the spirit that he has made to dwell in us”?
James 3:11 ESV
Does a spring pour forth from the same opening both fresh and salt water?
James 1:19-20 ESV / 87 helpful votes
Know this, my beloved brothers: let every person be quick to hear, slow to speak, slow to anger; for the anger of man does not produce the righteousness of
James 3:2 ESV / 85 helpful votes
For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body.
Psalm 12:4 ESV / 79 helpful votes
Those who say, “With our tongue we will prevail, our lips are with us; who is master over us?”
James 3:1-12 ESV / 75 helpful votes
Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness. For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body. If we put bits into the mouths of horses so that they obey us, we guide their whole bodies as well. Look at the ships also: though they are so large and are driven by strong winds, they are guided by a very small rudder wherever the will of the pilot directs. So also the tongue is a small member, yet it boasts of great things. How great a forest is set ablaze by such a small fire!
Colossians 4:6 ESV
Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person.
Psalm 19:14 ESV
Let the words of my mouth and the meditation of my heart be acceptable in your sight, O Lord, my rock and my redeemer.
Colossians 3:7-8 ESV
In these you too once walked, when you were living in them. But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth.
With patience a ruler may be persuaded, and a soft tongue will break a bone.
James 3:5 ESV
So also the tongue is a small member, yet it boasts of great things. How great a forest is set ablaze by such a small fire!
Psalm 109:17-19 ESV
He loved to curse; let curses come upon him! He did not delight in blessing; may it be far from him! He clothed himself with cursing as his coat; may it soak into his body like water, like oil into his bones! May it be like a garment that he wraps around him, like a belt that he puts on every day!
For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.