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Roman Catechism
Third Condition: Justice
The last condition (of an oath) is justice, which is especially requisite in promissory oaths. Hence, if a person swear to do what is unjust or unlawful, he sins by taking the oath, and adds sin to sin by executing his promise. Of this the Gospel supplies an example. King Herod, bound by a rash oath, gave to a dancing girl the head of John the Baptist as a reward for her dancing. Such was also the oath taken by the Jews, who, as we read in the Acts of the Apostles, bound themselves by oath not to eat, until they had killed Paul.