The Quranic Muhammad
In Sura 18:110, and elsewhere, Muhammad is commanded by Allah:

"Say, I am but a man like yourselves."

Nowhere in the Quran is Muhammad said to be sinless. Instead, Allah tells
Muhammad that he is no different than any other man.

Those Muslims who claim that Muhammad was sinless have failed to note Sura
40:55, where Allah told Muhammad to repent of his sins!

Muhammad Pickthal translates Sura 40:55 as saying:

"Ask forgiveness of thy sin".

The only way out of this passage is to state that Allah was wrong to ask
Muhammad to ask for forgiveness because he had nothing to forgive!

Pickthal's translation of Sura 48:1, 2 states:

"Lo! We have given thee,
(O Muhammad), signal victory,
that Allah may forgive thee
of past and that which is to
come, and may perfect His
favor unto thee, and guide
thee on a right path"

Not only was Muhammad commanded to repent of his sins and to seek
forgiveness, but he was also reminded off his past sins that Allah had
already forgiven and of future sins which would need future forgiveness!

Muhammad was not sinless according to the Quran. He was just one more poor
sinner in need of forgiveness and redemption.