Oath book

An oath book (also spelled oathbook or oath-book) is a book upon which an oath is sworn, typically in oaths of office and in courts of law to provide sworn testimony. Rooted in Germanic pagan and Jewish custom, the practice of swearing upon books is performed across various religions and countries. Christians generally swear upon the Bible (or historically a Gospel book), Jews by the Torah, Muslims by the Quran, and Hindus by the Bhagavad Gita, although some religious opposition to the practice exists, particularly among Quakers.