Quran does not tell lies
Sorry for the long post. I think that is why it is hard for you to understand. This is the summary: Moses was not a liar. Jesus is not a liar. Allah is not a liar. But some of the points in the previous Books were faked. Some of the points in the previous Books were concealed. We cannot follow the edited version of the previous Books. Quran (not Quaran) was given to correct all those lies and confirm the previous original teachings and the final of all.