Isaiah's divine self-identification language and Daniel's Son-of-Man imagery form the principal background.
Isaiah 43:10; Daniel 7:13-14 are important backgrounds.
The absolute ego eimi appears again, now linked to the revelatory significance of Jesus' crucifixion and exaltation.
The passage contributes to a deliberate sequence culminating in John 8:58 rather than standing as an isolated proof.
Many believe in Jesus as he speaks.