Did Jesus Ever Sin?
It is clear...that Jesus believed himself to be sinless...but what did the disciples think?
There are several reasons why we may confidently rely on (the disciples') evidence:
FIRST they lived in close contact with Jesus for about three years. They ate and slept together...they even had a common purse...The disciples got on one another's nerves. They quarrelled. But they never found in Jesus the sins they found in themselves.
SECOND they were Jews whose minds had been soaked since infancy in the doctrines of the Old Testament. And one Old Testament doctrine which they had certainly assimilated is the universality of human sin:
'They have all gone astray, they are all alike corrupt; there is none that does good, not one.'
'All we like sheep have gone astray; we have turned every one to his own way.'
In light of this biblical teaching they would not easily have attributed sinlessness to anyone.
THIRD the apostolic testimony to the sinlessness of Jesus is the more credible because it is indirect. They do not set out to establish the truth that he was without sin. Their remarks are asides.
From Basic Christianity