Question #117
of An Orthodox Catechism
Question
Is it lawful to swear by Saints, or other Creatures?
Answer
No, for a lawful Oath is an Invocation of God, whereby we desire that he, as the only searcher of Hearts, bear Witness unto the Truth, and will punish the Swearer if he1 wittingly swear falsely: but this Honour2 agreeth to no Creature.