The Old Testament (Tanakh (תנ״ך) in Hebrew) is a collection of different biblical books comprising the Jewish religious scriptures. It can be divided into three general categories: Historical, Poetic, and Prophetic. The Old Testament was inspired by God, giving His teachings to human beings in document form: using direct communication with Moses, communicating through the Prophets, and through works inspired by the Holy Spirit (Ruach HaKodesh), in the Sacred Writings. The human authors of some books are known, while for others the authorship remains a matter of controversy. The Hebrew names of these three sections give rise to the acronym "Tanakh": Torah (Instruction), Nevi'im (Prophets), and K'tuvim (Sacred Writings).