Is swearing a sin?

My friends and I constantly argue on whether or not swearing is a sin. They are all protestant and say that since it doesn’t clearly say in the Bible that swearing is a sin then is must not be one. As a Catholic I recognize it as a sin and seldom ever do that. Where can I find evidence in the Bible to show them that it is in there or are there proofs or logic that can explain that it is a sin. Thanks and God bless!

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