Just as the Father has life in Himself, so He gave to the Son to also have life in Himself.

JOHN 5:26

Chapter 5

24 Truly, truly, I say to you, He who hears My word and believes Him who sent Me has eternal life, and does not come into judgment but has passed out of death into life.  25 Truly, truly, I say to you, An hour is coming, and it is now, when the dead will hear the voice of the Son of God, and those who hear will live.  26 For just as the Father has life in Himself, so He gave to the Son to also have life in Himself;  27 and He gave Him authority to execute judgment because He is the Son of Man.  28 Do not marvel at this, for an hour is coming in which all in the tombs will hear His voice  29 and will come forth: those who have done good, to the resurrection of life; and those who have practiced evil, to the resurrection of judgment.

  30 I can do nothing from Myself; as I hear, I judge, and My judgment is just, because I do not seek My own will but the will of Him who sent Me.

  31 If I testify concerning Myself, My testimony is not true.  32 There is another who testifies concerning Me, and I know that the testimony which he testifies concerning Me is true.  33 You have sent people to John, and he has testified to the truth.  34 But it is not from man that I receive My testimony, but I say these things that you may be saved.  35 He was the lamp that was burning and shining, and you were willing to exult for a while in his light.

  36 But I have the testimony which is greater than that of John, for the works which the Father has given Me to finish, the works themselves which I do, testify concerning Me that the Father has sent Me.  37 And the Father who sent Me, He has testified concerning Me. You have neither heard His voice at any time, nor have you seen His form,  38 and you do not have His word abiding in you, for Him whom He sent, this One you do not believe.  39 You search the Scriptures, because you think that in them you have eternal life; and it is these that testify concerning Me.  40 Yet you are not willing to come to Me that you may have life.

  41 I do not receive glory from men.  42 But I know you, that you do not have the love of God in yourselves.  43 I have come in the name of My Father, and you do not receive Me; if another comes in his own name, you will receive him.  44 How can you believe when you receive glory from one another and do not seek the glory that is from the only God?  45 Do not think that I will accuse you before the Father; there is one who accuses you: Moses, in whom you have set your hope.  46 For if you believed Moses, you would believe Me; for he wrote concerning Me.  47 But if you do not believe his writings, how will you believe My words?