Salam rabimansur
In light of this discussion want to mention that I have heard that Muhammad is considered the Spirit of Truth mentioned in the book of John. But I'm wondering in light of the above if maybe Gabriel is actually the Spirit of Truth.
Are you referring to this verse?
John 15:26
But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
Now the Bible also uses the word "spirit" for prophets (1 John 4:1). So here the spirit of truth can be a prophet. We know that the Comforter=spirit of truth, so if we prove that Comforter=prophet Muhammad then spirit of truth=prophet Muhammad. To do that here is a small background.
The Quran says:
"And remember, Jesus, the son of Mary, said, 'O Children of Israel! I am the messenger of Allah (sent) to you, confirming the Law (which came) before me and giving glad tidings of a messenger to come after me,
whose name shall be Ahmed.' But when he came to them with clear signs, they said, 'This is evident sorcery!' " Al-Qur'an Chapter 61 Verse 6
“Ahmed" or "Muhammad" meaning "the one who praises" or "the praised one" is almost the translation of the Greek word Periclytos. But if you read the bible, you will find the word Ahmed (Muhammad’s PBUH other name) nowhere, neither will you find the word Periclytos in the bible. However, you find a word “paracletos” translated comforter in :
1. John chapter 14 verse 16:
"And I will pray the Father, and he shall give you another Comforter (paracletos), that he may abide with you forever."(That is true since Muhammad PBUH is considered the seal of the prophets. There will be no other prophets after him. His teachings will abide with us forever)
2. Gospel of John chapter 15 verse 26:
"But when the Comforter (paracletos) is come, whom I will send unto you from the Father, even the Spirit of truth which proceedeth from the Father, he shall testify of me (Muhammad PBUH did testified Jesus Christ to be one of the mightiest messengers of God. No Muslim is a Muslim if he does not believe in Jesus)."
Gospel of John chapter 16 verse 7:
"Nevertheless I tell you the truth; it is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you".
Paracletos is the warped reading for Periclytos. "Ahmed" or "Muhammad" meaning "the one who praises" or "the praised one" is almost the translation of the Greek word Periclytos. In the Gospel of John 14:16, 15:26, and 16:7, the word 'Comforter' is used in the English translation for the Greek word Paracletos. Jesus (pbuh) actually prophesised Ahmed by name here.