The basis of all biblical study is that God has revealed himself, not only through the Word, but in various ways in various times and places. These self-disclosures are called theophanies. The pivotal theophany in Old Testament times was God's revelation to Moses on Mount Sinai. So significant is this theophany in terms of God's covenant with his people and his progressive revelation that author Jeffrey J. Niehaus justifiably employs the term 'Sinai theology' to convey his theme. This book explores the meaning of this theophany throughout the Old Testament -- pre-Sinai, post-Sinai (especially the prophets), and the Psalms -- and its significance for the New Testament. It also examines parallels in ancient Near Eastern traditions.