John 14:16:"And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever."
We do not know exactly the original Aramaic word used by Jesus for Comforter. Other Bibles use Consoler, Advocate, Helper, and in Greek Bibles the word Paraclete. There are different explanations for it: Holy Spirit, the Word, a person, etc.
The Holy Quran states in Surah 61:6 that Jesus explicitly mentioned the name Ahmad: "And (remember) when Jesus Son of Mary said: "O, children of Israel! I am the Apostle of Allah (sent) to you confirming the Torah (which came) before me, and giving glad tidings of an Apostle to come after me, whose name shall be Ahmad (i.e. the second name of Prophet Muhammad, and literally it means the one who praises Allah more than others)."
Whatever the explanation is of the Comforter, we conclude that Jesus left an unfinished work and that someone was coning to complete his mission.  Let us examine in the light of the Bible if this Comforter fits the character of Prophet Muhammad [PBUH]:

1. "another Comforter": So many Comforters had come and another one was to come.
2. "that he may abide with you for ever": as there was no need for another one to come after him, and he was the Seal of all Prophets.  The teaching will abide for ever, will remain intact. In fact the Holy Quran and all his teachings remain as they were 1400 years ago.
3. "he will reprove the world of sin" John 16:8): all other Prophets, even Abraham, Moses, David and Solomon chastised their neighbors and their people for sin, but not the world as Muhammad [PBUH] did He not only rooted out idolatry in Arabia within a 23 year period, but also sent envoys to Hercules, the Sovereigns of the empires of Persia and Rome, to Najashi, the King of Ethiopia and to Muqauqis, the Governor of Egypt.

He reprimanded the Christians for dividing the Unity of God into trinity, for having raised Jesus to Son of God and God Himself.  It was he who condemned the Jews and Christians for having corrupted their Scriptures, demonstrated the birthright of Ishmael [PBUH], and cleared the Prophets from accusations of adultery, incest, rape and idolatry.
4. "the prince of the world is Judged" (John 16:11).  This is Satan as explained in John 12:31 and 14:30. So Prophet Muhammad [PBUH] came to chastise the world on account of judgement.
5. "the Spirit of Truth" (John 16:13).  Since childhood Prophet Muhammad [PBUH] was called Al-Ameen, i.e. the Honest or Truthful One, and "he will guide you into all truth: . . ." (John 16:13).
6. "For he shall not speak of himself, but whatsoever he shall hear, that shall he speak" (John 16:13).

The Holy Quran is God's word.  Not a single word from Prophet Muhammad [PBUH] or his companions was included. The angel Gabriel read it to him, he memorized it and it was written down by his scribes. His own sayings and teachings were recorded in Hadeeth or Tradition (plural, Ahadith).
Compare with Deuteronomy 18:18:”…and will put my words in his mouth; and he shall speak unto them all that I shall command him."
This corresponds with Surah 53:2-4: "Your companion [Muhammad] is neither astray nor being misled.  Nor does he speak of [his own] desire. It is only the inspiration that is inspired.’’
7. "and he will shew you things to come" (John 16:13).  All prophecies of Prophet Muhammad [PBUH] came to pass.
8. "He shall glorify me" (John 16:14). Actually the Holy Quran and Prophet Muhammad [PBUH] have more reverence for Jesus [ PBUH] than the Bible and Christians themselves.  The following will clarify:

a. to believe in his death on the cross discredits his prophethood according to Deuteronomy 13:5: "And that prophet, or that dreamer of dreams, shall be put to death…" It also stamps him as accursed (May Allah forbid!) according to Deuteronomy 21:22-23: “…for he that is hanged is accursed of God . . ."

b. Matthew 27:46: "…My God, my God, why hast thou forsaken me?" Could this not come from someone other than Jesus? Even a nonprofit would smile at agony as he knew that his death would win him the title of martyr.  Was this not an insult to Jesus in not having faith in Allah?

c. We Muslims cannot believe that Jesus could label the Gentiles as dogs and swine and address his mother with Woman, as the Holy Quran states in Surah 19:32: "And dutiful to my Mother [i.e. Mary], and [Allah] made me not an unblessed and arrogant." Matthew 7:6: "Give not that which is holy unto the dogs, neither cast ye your pearls before swine… ." John 2:4: "Jesus saith unto her [Mary], Woman, what have I to do with thee?"