[Heb 1:1-2] The Psalms lay the foundation for the Prophets, hundreds of years beforehand. There are 7 Old Testament passages referenced in Hebrews 1, all from the Psalms and 2 Sam 7, not the prophets. Hebrews is a book of contrasts between the New Covenant and the Old Covenant, and the introduction highlights that God spoke long ago in type/shadow/Promise through Prophets (OT) vs reality/Fulfillment (NT) in Jesus. Jesus is the foundation of everything: our life and hope, the alpha and omega of Christianity