John 5:27

“And he has given him the authority to execute judgment because he is the Son of Man.”

Not only does Jesus give life now, but as the Son of Man He has been given the authority to execute judgment. The connection with the Son of Man shows that the idea is taken from Daniel 7:9, where God takes His seat at the Judgment, the court sits in judgment and the books are opened. Then one like a son of man comes before God and is given dominion and glory and kingship, that all peoples, nations and languages should serve Him, an everlasting dominion that will not pass away. The right of judgment has been passed on to Him.

Thus it is in His glorified humanity as the chosen King that Jesus is made the Judge, as Son of Man as well as Son of God, with the power to execute judgment. As the introducer of the new eternal age He has also the right to decide who will enter it.

Note the distinction that is made between the fact that it is as ‘the Son of God' that He gives life, something which is God's prerogative alone, but that it is as ‘the Son of Man' that He will one day execute judgment. Who better to judge than One Who has Himself lived as man?