John 8:18

¹⁶ But even if I do judge, My judgment is true, because I am not alone; I am with the Father who sent Me.

¹⁷ Even in your own Law it is written that the testimony of two men is valid.

I am One who testifies about Myself, and the Father, who sent Me, also testifies about Me.”

¹⁹ “Where is Your Father?” they asked Him. “You do not know Me or My Father,” Jesus answered. “If you knew Me, you would know My Father as well.”

²⁰ He spoke these words while teaching in the temple courts, near the treasury. Yet no one seized Him, because His hour had not yet come.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: I am One who testifies about Myself, and the Father, who sent Me, also testifies about Me.”
KJV: I am one that bear witness of myself, and the Father that sent me beareth witness of me.
WEB: I am one who testifies about myself, and the Father who sent me testifies about me.”
ASV: I am he that beareth witness of myself, and the Father that sent me beareth witness of me.
DARBY: I am [one] who bear witness concerning myself, and the Father who has sent me bears witness concerning me.
BLB: I am the One testifying about Myself, and the Father having sent Me testifies about Me.”

ÅB: Jeg er den som vitner om meg, og Faren, som har utsendt meg, vitner om meg.
OTB: Jeg er en som vitner om Meg selv; Mitt andre vitne er Faderen som sendte Meg.”
B1930: Jeg er den som vidner om mig, og Faderen, som har utsendt mig, vidner om mig.

John 8:58
“Truly, truly, I tell you,” Jesus declared, “before Abraham was born, I am!”
Read in context
Revelation 1:17–18
When I saw Him, I fell at His feet like a dead man. But He placed His right hand on me and said, “Do not be afraid. I am the First and the Last,
Read in context
John 8:38
I speak of what I have seen in the presence of the Father, and you do what you have heard from your father.”
Read in context
John 8:12
Once again, Jesus spoke to the people and said, “I am the light of the world. Whoever follows Me will never walk in the darkness, but will have the light of life.”
Read in context
John 8:51
Truly, truly, I tell you, if anyone keeps My word, he will never see death.”
Read in context
John 10:14
I am the good shepherd. I know My sheep and My sheep know Me,
Read in context
1 John 5:6–12
This is the One who came by water and blood, Jesus Christ—not by water alone, but by water and blood. And it is the Spirit who testifies to this, because the Spirit is the truth.
Read in context
John 8:25
“Who are You?” they asked. “Just what I have been telling you from the beginning,” Jesus replied.
Read in context