What does it mean that Jesus sat down after purging our sins?

When Hebrews 1:3 states that Jesus sat down at the right hand of the Father after purging our sins, it symbolizes the completion of His redemptive work. In the Old Testament sacrificial system, priests never sat down because their work was never complete, as they continually offered sacrifices. Conversely, Jesus' seating signifies His work did not require further sacrifices. This act asserts His authority over all and His role as the intercessor for believers (Hebrews 10:12). He reigns as sovereign Lord, and His finished work offers us rest from striving for our own righteousness.