Westminster Confession of Faith
Chapter 22: Of Lawful Oaths and Vows
3: Whosoever takes an oath ought duly to consider the weightiness of so solemn an act, and therein to avouch nothing but what he is fully persuaded is the truth:[449] neither may any man bind himself by oath to any thing but what is good and just, and what he believes so to be, and what he is able and resolved to perform.[450]
Daily Westminster 