how to reinstall safari after deleteing it

Reinstall Safari

"Reinstalling Safari

If you deleted Safari and don't have a Time Machine backup or other backup, reinstall macOS to put Safari back in your Applications folder. Reinstalling macOS doesn't remove data from your computer." 

Update or reinstall Safari for your computer - Apple Support

Do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart). Run Disk Utility and select First Aid. Then re-install the OS.

Reinstall from macOS Recovery

OS X Recovery

How did you manage to delete it? As far as I know Safari is a default Mac app and cannot be deleted.