Part of membership within many coven or esoteric group involves the rite whereby an oath is sworn. Sometimes, depending on the structure of the group, there are a number of oaths that are sworn as the member moves through the ranks. Regardless of the number of oaths, very rarely does one supersede any made previously - more often than not, any subsequent oaths tend to for an additional layer (or enhancement) of the initial oath.
The word oath comes from the Anglo-Saxon āð (also referred to as a "a true principle or belief, especially one of fundamental importance. An oath is also a "solemn appeal to a deity", as well as being a "formally affirmed statement or promise accepted as an equivalent of an appeal to a deity or to a revered person or thing; affirmation".