Christ as the divine Word is specifically identified as the impeccably holy Light of deity in John 1:1-5:
In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through him all things were made; without him nothing was made that has been made. In him was life, and that life was the light of men. The light shines in the darkness, but the darkness has not understood it.
Jesus Himself said in John 8:12:
I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life.
The illuminating holiness of Christ as the divine Light is so overwhelmingly infinite that even the best of mere human beings (in this case John the Baptist) would have to be described this way:
There came a man who was sent from God; his name was John. He came as a witness to testify concerning that light, so that through him all men might believe. He himself was not the light; he came only as a witness to the light (John 1:6-8).
John the witness could sin, and we as witnesses can sin, hut Christ the holy Light of the world could not possibly have sinned! Far from being capable of sinning, Christ came to earth as the divine Standard of holiness that all of us need to worship and obey!