What is the spiritual significance of swearing on a Bible among the various churches and denominations?

When someone is deposed in court, they are asked to swear on a Bible. My premise is that the use of a printed Bible in this instance is derived from a pagan ritual or rituals, rather than a practice that the holy Scriptures themselves would encourage. What is am overview of Christian beliefs about the spiritual significance of the practice? I am in no way dismissing the seriousness (legal, personal, or spiritual) of the sin of lying; I am talking about the specific act involving putting one's hand on the Bible itself, particularly in official or legal situations. The closest question on this topic doesn't get into the significance of the printed Bible itself: - [Swear to tell the truth 'so help me God'?](https://christianity.stackexchange.com/questions/3730/swear-to-tell-the-truth-so-help-me-god)