Peace be upon you all.
This question has been in my mind for quite sometime, but I cannot come to an answer. Perhaps there is no way to actually know, but I might be overlooking something and maybe God has blessed someone here with knowledge I have not yet attained.
We all know that messengers and prophets were humans and therefor fallible. We have many examples of mistakes messengers made, including but perhaps not limited to: Muhammad prohibiting something God did not (66:1), turning away from a blind man and giving attention to someone he thought was better (Chapter 80), fearing the people instead of God (33:37); Abraham asking for his father's forgiveness (9:114), arguing about Lot's people (11:74-76); Moses killing a man (28:15-16), Jonah trying to escape from his duties (37:139-144).
In terms of these mistakes we can argue that some are more serious than others, but they were errors nonetheless.
My question is: Is is possible for messengers to be wrong in terms of preaching things and attributing them to God? Sura 21 verse 27 I have understood to mean that when they are acting as the messenger they cannot, but they can state their own opinions which may or may not coincide with the truth. Do we have any precedent or proof that a messenger of God is able to preach something wrong about God to his audience?
I have yet to find any basis for this in the Qur'an and it is a major question I pose to people who believe Rashad Khalifa was a messenger. Some people do not recognize he made any mistakes and fall into idol worship by attributing every word he uttered to God. Some people believe he was a messenger, but then say he was human and made mistakes, but the mistakes are things he preached about God's words and preached as God's truth. How can a messenger of God be correct about telling people to worship God alone, but be wrong in so many ways regarding how to worship Him? Then there are some who reject him as being a messenger of God based on those mistakes or misunderstandings attributed to God.
Please excuse me if I am mixing up issues. The issue of Rashad is merely an example; I am more interested in the overall concept. I myself was convinced Rashad was a messenger, but so many things have come to my attention and I need to reevaluate my beliefs about messengers based on the Qur'an alone.