In fulfillment of prophecy (Psalm 16:9-11), to mark Him out as the Son of God (Romans 1:4), and to show that Jesus' sacrifice on the Cross was sufficient and acceptable, once and for all, for the sins of the world, God, the Father, raised Jesus from the dead (John 19:30; Acts 2:24; Romans 4:24-25; I Corinthians 15:14-17).
Because He had so perfectly performed the will of the Father, because of the Father's incredible plans from the foundation of the world for His own Son, and for the human race, Jesus was not only raised from the dead, but was exalted and elevated to the highest position in Heaven (Acts 2:32-36; Romans 8:29-30; Ephesians 2:20-22; Hebrews 1:2-4, 13; 2:9-10; 8:1; 10: 5-14; 12:1-2; 13:20).
In the ancient world, if a king wanted to bestow the highest honor on another, he would seat that person at his own right hand (I Kings 2:19).The king was suggesting he recognized that person as an equal.
Again, we may take for granted that, of course Jesus would naturally deserve to be seated in the place of highest honor in the heavens; He is, after all, God, Himself!
But what we overlook, to our own disadvantage, is that Jesus Christ holds this position, not only as Son of God, but as Son of MAN, opening Heaven, itself, for other men to follow (Hebrews 2:10; 6:18-20).
Co-residence in Heaven was not a hope that men had in Old Testament Judaism. The hope of Heaven is something God only made known to men in the New Testament Gospels and Epistles, with the coming of the incarnate Christ and the fuller unfolding of the marvelous Grace of God (John 1:17; 14:1-3; Ephesians 2:6-7).
More later, Deo Volente.