Doctrines found in John 8:

The Trinity

17  “Even in your law it has been written that the testimony of two men is true. 18 I am He who testifies about Myself, and the Father who sent Me testifies about Me.”

The Divinity of Jesus

19 So they were saying to Him, “Where is Your Father?” Jesus answered, “You know neither Me nor My Father; if you knew Me, you would know My Father also.”

42 Jesus said to them, “If God were your Father, you would love Me, for I proceeded forth and have come from God, for I have not even come on My own initiative, but He sent Me.”

58 Jesus said to them, “Truly, truly, I say to you, before Abraham was born, I am.”

The Sovereignty of God

20 . . . and no one seized Him, because His hour had not yet come.

The Exclusivity of Christ

24  “Therefore I said to you that you will die in your sins; for unless you believe that I am He, you will die in your sins.”

There are, of course, more doctrines than these in this chapter, and more verses in this chapter concerning these doctrines.