From the translation by Muhammad Asad (Leopold Weiss)

About the translator:
Muhammad Asad, Leopold Weiss, was born of Jewish parents in Livow, Austria (later Poland) in 1900, and at the age of 22 made his first visit to the Middle East. He later became an outstanding foreign correspondent for the Franfurter Zeitung, and after years of devoted study he became one of the leading Muslim scholars of our age. His translation of the Holy Qur'an is one of the most lucid and well-referenced works in this category, dedicated to “li-qawmin yatafakkaroon” (For people who think).

Chapter 61, verse 6
And [this happened, too,] when Jesus, the son of Mary, said: “O children of Israel! Behold, I am an apostle of God unto you, [sent] to confirm the truth of whatever there still remains of the Torah and to give [you] the glad tiding of an apostle who shall come after me, whose name shall be Ahmad. [ 1 ]
But when he [whose coming Jesus had foretold] came unto them with all evidence of the truth, they said: “This [alleged message of his] is [nothing but] spellbinding eloquence!”
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Translator’s Notes
[ 1 ] The prediction is supported by several references in the Gospel of St. John to the Parakletos (usually rendered as “Comforter”) who was to come after Jesus. This designation is almost certainly a corruption of Periklytos (“the Much-Praised”), an exact translation of the Aramaic term or name Mawhamana. (It is to be borne in mind that Aramaic was the language used in Palestine at the time of, and for some centuries after, Jesus, and was thus undoubtedly the language in which the original – now lost – texts of the Gospels were composed.) In view of the phonetic closeness of Periklytos and Parakletos it is easy to understand how the translator – or, more probably, a later scribe – confused these two expressions. It is significant that both the Aramaic Mawhamana and the Greek Periklytos have the same meaning as the two names of the Last Prophet, Muhammad and Ahmad, both of which are derived from the verb hamida (“he praised”) and the noun hamd (“praise”), An even more unequivocal prediction of the advent of the Prophet Muhammad – mentioned by name, in its Arabic form – is said to be forthcoming from the so-called Gospel of St. Barnabas, which, though now regarded as apocryphal, was accepted as authentic and was read in the churches until the year 496 of the Christian era, when it was banned as “heretical” by a decree of Pope Gelasius. However, since the original text of this Gospel is not available (having come down to us only in an Italian translation dating from the late sixteenth century), its authenticity cannot be established with certainty.