I asked this question in judaism.SE, and received an answer as can be seen in the link.
To best of my understanding, according to the Jewish tradition, Abraham compiled some books/scriptures during his lifetime. I believe these scriptures could be what the Quran is referring to. However, they are now lost, so we don't know the exact contents of them.
Seth (شيث) is not mentioned by name in the Quran. He is mentioned in a hadith recorded by Ibn Hibban, whose authenticity has been criticized by some. There is scarce evidence about him.
أنزل على شيث خمسون صحيفة
fifty pages were sent down to Sheeth
— Sahih Ibn Hibban
If you want an Islamic answer, I can't help much, but a historical answer is easy.
The Pentateuch, which figures in Moses, Adam, Abraham and Ishmael, is the first five books of the Jewish and Christian Scripture. Tradition ascribes the books to Moses himself and would make it written almost two thousand of years before Mohammed.
The further adventures of ...
Just think iglas I had bad thoughts about allah to. The reason is that you think outside iglas and it's make you crazy. We are human and we like to think to much about things if you have iglas in your mind don't think further it comes oke.
Qoel hoewa Allaahoe ahad
Lem yalid wa lem yoeled
Wa lem yakoe l-lahoe koefoewen ahad
In the ...
This verse does not necessarily imply that there were separate prophets for the Jinn.
Ibn Abbas, Mujahid ibn Jabr and others held the opinion that the Messengers here were all human - rather some of them had followers among the Jinn and they sent Jinn disciples to preach among their own kind ... hence these were the messengers of the Messengers of Allah. It ...