Today’s question is as below. For the three people still waiting for their question to be answered – I am in process of doing so.
What is written on the scrolls inside the Ark?
I am assuming you are speaking regarding the scroll found in the back of a Shul within the Ark and the answer is simple – it is the most important text of them all – the Torah!
I am going to link to a Wikipedia article that explains it in far more detail but in a nutshell it is a hand written copy of the Torah which is commonly known as the Sefer Torah.
Excluding commentary you can often find in a book form of the Torah (commonly called Chumash) they are the exact same between the books and the scrolls.
You can find more information about how it is made and much more on Wikipedia here: Sefer Torah.