Depending on whether you need a full professional score or just a simple lead sheet, these are the most reliable sources:

If a website prompts you to "install a download manager," "update your PDF viewer," or download an executable file to view "Delilah," This is a common tactic used to distribute malware, adware, or browser hijackers. 2. The Legalities of "Free" Sheet Music

This is perhaps the largest community-driven platform. Users often share their arrangements of "Delilah" in PDF format.

Sheet Music Plus frequently offers partial previews of their official arrangements. While not a full free PDF, you can print the first page to test the arrangement. C. Free-Scores.com

What or ensemble are you planning to play this on?