A paragraph of text placates every page I create

I’m building a site in Widescreen theme. I’ve self hosting it on an commercial server. Every page I created I would find a text paragraph I once copied and pasted to my about page. I can not find the source of that text on any of the created pages that are on the site. If I create a new page entitled Test -1, that text paragraph is embedded on the page. If I click on the seeing the actual page, all nine pages on my site has that paragraph text at the bottom of the page. If I return to the dashboard, the page is void of any text in the Upload/Insert area. How do I find the original page it was pasted so I could delete it and every page will be rid of it. I used the search box, but it does not show me the original text box.