bash-4.1$ date +'hello world'
hello world

bash-4.1$ runWithDelay () { sleep $1; shift; ${@}; }

bash-4.1$ runWithDelay 1 date +'hello world'
date: extra operand `world'
Try `date --help' for more information.

bash-4.1$ runWithDelay () { sleep $1; shift; "${@}"; }

bash-4.1$ runWithDelay 1 date +'hello world'
hello world