Epistle to the Hebrews is a biblical book written by an unknown author, also known as the Letter to the Hebrews. This book is a theological masterpiece that explains the relationship between the Old and New Testaments. The Letter to the Hebrews uses different synonyms throughout the book such as "Letter of Paul to the Hebrews," "Epistle to the Hebrews" and "Hebrews." These synonyms are used to describe the book depending on the context and the perspective of the writer. However, despite the different names given to the book, its message remains unchanged and focused on strengthening the faith of believers through the teachings of Jesus Christ.