Thank you for your answer.
The problem is as follows:
For example I have page with id 8 and page with id 2 which one I want to show on same page in two different divs.
And my code looks like this:
<div><?php $page_id = 8; page_content(); ?></div>
<div><?php $page_id = 2; page_content(); ?></div>
But it puts out page with ID 1 Two times. How can I manually display chosen content at chosen place at the page?