Wiktionary
not for the world
interj. (context idiomatic English) Absolutely not; under no circumstances. A defiant no. (from 18th c.)
Usage examples of "not for the world".
God, I would never have hurt that little angel, not for the world, but she had a reflection, a real reflection!
Besides, this inestimable kitten of the breed most worshipped by the ancient Egyptians has already taken cold, and I would not for the world expose the susceptible animal any longer than is necessary to the dampness of the night-air.
But if at any time you would inure yourself by exercise to labour, and bearing hard trials, do it for your own sake, and not for the world.