The ritual of taking oaths goes back centuries in Western Europe. In antiquity, oaths were often demanded of religious and governmental leaders, as well as those in certain professions. In ancient Rome, oaths were also demanded of soldiers.

Why do we have oaths?

Why do we take oaths? ... An oath is a solemn promise, often invoking a divine witness, regarding one's future action or behavior. This is the reason nearly all professions have oaths; they use these words as a binding contract to hold them accountable for their ethical actions, behaviors, and ...

Where did swearing on the Bible come from?

The earliest Western use of oath books in a legal setting dates to ninth-century England when, in the absence of a structured royal government, certain transactions were conducted at the altar, the participants swearing on a gospel book.