Context: Peter at Pentecost argues that Psalm 110:1 applies to Jesus, not David, establishing the foundation for Christ's heavenly priesthood. The enthronement at God's right hand is the position from which Jesus exercises His eternal intercessory ministry as great High Priest, a role Psalm 110:4 explicitly assigns to the one seated there.
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Christological Connection: Peter's Pentecost sermon establishes the christological and priestly interpretation of Psalm 110:1 that becomes foundational for the New Testament's understanding of Christ's work. The apostle argues that David himself did not ascend to heaven, therefore "The Lord said to my Lord, 'Sit at my right hand'" must refer to David's greater Son—Jesus. This enthronement is inseparable from Christ's priesthood, as Psalm 110:4 reveals: "The Lord has sworn and will not change his mind, 'You are a priest forever after the order of Melchizedek.'" Where Aaron stood daily offering repeated sacrifices (Hebrews 10:11), Christ sat down—His priestly work of atonement finished (Hebrews 10:12). But His session is not retirement; it is the position from which He exercises eternal intercession (Hebrews 7:25). Peter's citation at Pentecost announces that the Aaronic priesthood has been superseded by a superior priest in a superior position offering superior mediation forever.
Connection Method(s): Promise-Fulfillment + Contrast — Peter's Pentecost application of Psalm 110:1 to Christ fulfills the prophetic promise of messianic enthronement; Christ's sitting at God's right hand demonstrates completed priestly work in contrast to Aaron's standing daily service, announcing that the Aaronic priesthood has been superseded.
Trajectory Table: 001 - Aaron (The Great High Priest)