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证人准备在法庭作证时，他们会举起右手这样说：“我起誓宣告，我所说的是真实的，全都符合事实，完全没有虚假。愿神帮助我。”证人呼求神做见证人，证明他的证供是真实无伪的。

民数记教导的基本原则，是我们必须遵守所许的愿，我们所说的话必须是可靠的；说诚实话是基督徒不可缺少的特质，我们没有歪曲事实或说谎的余地，因为神呼召我们要彰显祂的形像。“神非人，必不致说谎；也非人子，必不致后悔。他说话岂不照着行呢？他发言岂不要成就呢？”（民 23:19）如果我们说的话不可信，我们就像谎言之父魔鬼一样的了。（参约 8:44）

耶稣断言说诚实话的重要性，祂这样说：“你们的话，是，就说是；不是，就说不是；若再多说，就是出于那恶者” 。（太 5:37）祂的意思是说，我们所说的话既然是千真万确，我们便根本不需要起誓来保证。但是有些时候，别人会要求我们起誓，我们只需要照实直说便足够了。惟愿我们都能做到言行一致。

When a witness is ready to testify in court, they raise their hand and say, "I swear to tell the truth, the whole truth, and nothing but the truth. So help me God." The witness is calling God to be a witness to the truth of the testimony.

The basic principle taught in Numbers 30 is that vows must be kept. Our word must stand. Truth telling is an essential characteristic of Christians. Twisting the truth or telling lies has no place among us. The reason for this is that we're called to reflect God. "God is not human, that he should lie, nor a human being, that he should change his mind. Does he speak and then not act? Does he promise and not fulfill?" .(Numbers 23:19) When our word can't be trusted, we look like the devil, the father of lies.(John 8:44)

Jesus asserted the importance of truth telling when he said, "All you need to say is simply 'Yes' or 'No'; anything beyond this comes from the evil one". (Matthew 5:37) He was saying that we should be so marked by the truth that we should not need a vow to back up our word. Sometimes a vow will be required of us. But let's have our word be enough. May our word be consistent with our actions.