Jesus' teaching on swearing is that Christians should
Jesus' teaching on swearing is that Christians should not swear at all. Jesus taught that swearing by anything, whether by heaven or by earth or by any other thing, comes from evil and is unnecessary. Instead, Jesus instructed his followers to let their "yes" be "yes" and their "no" be "no," meaning that they should simply speak the truth and be honest in their dealings with others, without needing to add any oaths or promises. By doing so, Christians demonstrate integrity and trustworthiness, and avoid falling into the trap of making false promises or using deceitful language.