Witnesses have to swear on the Bible.

【swear】证人须手按《圣经》宣誓。

Mr. Angel was dreadfully serious and made me swear on the Bible that I would always be true to him no matter what happened." " What did your mother think about all this?

安吉尔先生非常严肃，让我在圣经上发誓，无论发生什么，我都会永远忠于他。“你母亲对这一切是怎么想的？