The Quran's closing surah, a short prayer for refuge in God from the whispered temptations of "the retreating whisperer" — ending the book, fittingly, on the same note of seeking protection and guidance that Al-Fatiha opened it with. It specifically names the source of temptation as "the retreating whisperer" who withdraws the moment God is remembered, whispering "into the breasts of mankind" from among both jinn and humans — treating temptation as something that can come from either kind of source. It closes the entire Quran with the phrase "among jinn and mankind," a deliberate final pairing that mirrors the opening surah's own universal address to "all the worlds," giving the whole text a symmetrical bookend between its very first and very last words.
Ends the book on the same note it opened with — seeking guidance and protection — bringing the whole text full circle. Naming both jinn and humans as potential sources of harmful whispering is often cited as a reminder that not all corrupting influence is supernatural — some of it, the surah suggests, comes from other people entirely. That symmetry between the Quran's opening address to "all the worlds" and its closing reference to both jinn and mankind is frequently cited by scholars studying the text's overall structure as evidence of a deliberately designed circular frame around the entire book.