Should You Take An Oath? Suppose you are confronted with a situation where you are contemplating whether or not you should take an oath. Here is a partial list of Biblical guidelines for taking oaths.
1. The object of the oath must be Biblical. It almost goes without mentioning that one cannot bind himself to do that which Scripture forbids, since no one can bind himself to sin.[13]
2. What you are about to say must be true, or you must do what you are about to promise. In addition to undertaking a Biblical objective, you must also speak the truth and do what you say you will do. "If a man makes a vow to the Lord, or takes an oath to bind himself with a binding obligation, he shall not violate his word; he shall do according to all that proceeds out his mouth" (Num. 30:2) 
They took their Oath.