It doesn't have to be in any literature.
yes, it does. because we have to know about it somehow. otherwise, we're just making stuff up.
why jewish literature? well, you still haven't answered my quotes from the koran.
The question is, did Jesus and the Apostles actually live, preach, and teach?
i believe they did, but in truth i do not actually know for sure. we have no record of jesus outside of the new testament. and there is a reason that that is not regarded as history.
and as i've pointed out, i believe some of the apostles to be WRONG.
But, if they did, and the evidence indicates that they did, then they presented God's offer to the Jews (and Gentiles).
some of them, at least.
when god presented his children with the (first) covenant, the ten commandments, it was a contract that all of israel was held to. how were the ten commandments presented? did everyone hear them, or just moses who had to write them down and present god's word to the people?