seo – How can I verify if certain text-based content is being used elsewhere?

I have ordered a blog article for my website, which has been written by someone else. Now I received the text from the original author, but I am a little worried if he has copied the content of other websites, which will have a very negative SEO result for me.

My question is: How can I be sure that you have not copied the requested content from another site? Is there some kind of tool or something? Thank you.