Jesus didn't belong to the realm of spiritual death. He possessed the Life of God.

........Eternal Life in the spirit of man today,
........make him an heir of God and
........a joint-heir with Christ.

Romans 8:16
"The Spirit itself beareth witness with our spirit, that we are the children of God:
17 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together."