The Book of the Law
Liber AL vel Legis (Classical Latin: [ˈlɪbɛr aː.ɛɫ wɛl‿ˈleːgɪs]), commonly known as The Book of the Law, is the central sacred text of Thelema. The book is often referred to simply as Liber AL, Liber Legis or just AL, though technically the latter two refer only to the manuscript.