For as the Father hath life in himself; so hath he given to the Son to have life in himself; Hath he given to the Son to have life, etc. - Here our Lord speaks of himself in his character of Messiah, or envoy of God.
Related Commentaries of John 5:26
John 5:26
26 For as the Father hath life in himself; so hath he given to the Son to have life in himself;