Jesus explicitly appeals to the Torah rule that the testimony of two people is true, using the witness principle in his dispute over the validity of his own testimony. The appeal is legal and explicitly scriptural.

Isaiah’s light-to-the-nations servant provides a strong messianic horizon for John 8:12.

Isaiah 60 contributes the nations-and-light horizon behind John’s world-wide light imagery.

John 8:24 resonates closely with Isaiah’s Greek divine self-identification.

John 8:28 continues the absolute “I am” pattern found in Isaiah’s divine declarations.

Jesus the light of the world reaches new-creation consummation when the Lamb is the city’s lamp. The light of the world becomes the Lamb who illumines the New Jerusalem.

Isaiah’s servant-as-light mission provides a strong canonical horizon for Jesus’ Light-of-the-World claim.