Jesus is the Only Sinless Prophet, Not Muhammad, According to Islam Says Qur'an

John Gilchrist is a leading expert on Islam (type " Books and Outlines by John Gilchrist" in Yahoo or Google search box & click on link by same name): "Jam' Al-Qur'an: The Codification Of The Qur'an Text," "Muhammad and the Religion of Islam," "Facing the Muslim Challenge: A Handbook of Christian-Muslim Apologetics," "Is Muhammad Foretold in the Bible?," etc. are just a few of his works.
John Gilchrist's presentation is followed by Steve Morrison & Larry Wessels in the Christian Answers video, "Answering Islam #2: Sinless Islamic Prophets? Only Jesus was Sinless According to Islam" from their 10 part, 10 video series entitled, "Answering Islam."

It is a cherished doctrine among devout Muslims that Muhammad had achieved sinlessness or (even more) was always sinless after his birth. Some believe that Muhammad had merely negligible faults, brief forgetfulness, small errors, or superficial weaknesses, but this does not mean that he should be classified as a sinner. But does this belief stand up under scrutiny in the light of the Quran and sound hadiths?

In Mecca, Muhammad receives this command about his sin.
40:55 Then have patience (O Muhammad). Lo! the promise of Allah is true. And ask forgiveness of thy sin [dh-n-b] and hymn the praise of thy Lord at fall of night and in the early hours. (Pickthall)
The Arabic word dhanaba (verb form) come from the root dh-n-b and is defined below in this section. This verse is unambiguous. Muhammad has sin.
It is one of the great ironies in the Quran that the next sura can be titled either "Muhammad" or "War" (qital, root is q-t-l). Sura 47 was sent down, according to Sayyid Abul A'La Maududi (d. 1979), a respected commentator.