command [ -pvV ] simple command
       The simple command argument is taken as an external command
       instead of a function or builtin and is executed. If the
       POSIX_BUILTINS option is set, builtins will also be executed but
       certain special properties of them are suppressed. The -p flag
       causes a default path to be searched instead of that in $path.
       With the -v flag, command is similar to whence and with -V, it is
       equivalent to whence -v.

       See also the section `Precommand Modifiers' in zshmisc(1).
