Jesus Never Sinned
In the history of the world, no one has claimed with any credibility that they are without sin because to do so is to declare that one's words, actions, thoughts, and motivations are continually perfect and pure. And, as the old adage goes, no one is perfect. Even those religious leaders who are widely recognized as the most devout and morally upright (e.g. Mohammad, or Gandhi) have claimed that they were indeed sinners. But, Jesus declared that He was not only morally superior to everyone who has ever lived, but in fact sinless. The perfect sinlessness of Jesus makes Him admittedly more holy and worthy of our devotion than anyone who has ever lived and helps to prove that He was/is God because God alone is without sin.
John 8:46 (ESV)
46 Which one of you convicts me of sin? If I tell the truth, why do you not believe me?