The Son is the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word. After he had provided purification for sins, he sat down at the right hand of the Majesty in heaven.
New International Version
What does Hebrews 1:3 mean?
This verse also provides important support for the divinity of Jesus. That is, these words imply that Jesus Christ is, in fact, God. The Greek word characktēr is translated here as “exact imprint” or “exact representation.”. The Greek word for “nature” here is hypostaseōs. This is the source of the theological term “hypostatic union,” a fancy way of saying that Jesus is both God and man. Combined, these words mean that Jesus’ nature is identical to that of God. Christ is divine, exactly as God is divine.
The reference to sitting at the “right hand” is important in ancient literature. This is a symbolic reference to honor and power. A person seated at the right hand of the king was considered trustworthy, and he was bestowed with the power of that king. References to Jesus as “seated” at the right hand of the Father imply His absolute power and authority.