Thefirst 5 books of the bible contain two texts in it, the J and E texts which represent two different traditions and legends of two different peoples which ended up becoming combined to form the Jews. However as these are both the word of god they were both included when it was writen down for fearing of modifing the Word of God. Both texts have very different styles and is quite obviuous apparently when reading un translated verions, the J text (from what I remember) is a lot more like traditional religions with fanatastic tales and long descriptions while the E text (assuming I have them right, can't quite remember which what the letters stand for, Jacob and Esau I think) is very brief when it comes to desciptions and is very bear bones in stlye, only statements of what happened.
Or at least that is as close as I can remeber from philosophy when we did the different stlyes of ancient thinking (Hebrew and Greek, though the J text actually counts as greek style). Can't remember the name of the person who first did it, oh well, did my best.