Canonum De Ius Positivum
Canons of Positive Law
IV. Consensus
4.3 Consensus Obligation
Article 125 - Oath
Canon 2261 (link)
An Oath is a solemn appeal to the Divine Creator by invocation and the presence of at least two witnesses that a pronouncement is true or a promise binding.
Canon 2262 (link)
An oath is only a valid oath when it is sworn in recognition of the rights of all men and women as Sponsors to Persons present within the court including the spirit of the living law and includes a pledge to speak honesty before the court. The touching of any object during such swearing is materially irrelevant to the validity of any oath.