The Library of Babel is a database of millions of random strings of text. Among this randomness, passages from other sources inevitably appear, such as the book of Genesis or works by Shakespeare, or this question. You can also search the library for specific strings.
If a copyrighted work appears in the database, is it breaching copyright? If not, can I use that text without breaching copyright (provided I indicate my source is the Library of Babel)?
You can find the Library of Babel at https://libraryofbabel.info/