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You could do that, as long as you terminated the end of the mains cable in a sensible way, eg. mount in terminal block, and don't strip insulation back. It's slightly bodgy though; I'd want to know where it's from, and to protect others in the future. However, you can at least improve the situation just now by making it more safe...
Should be able to trace that cable back somewhere, unless it disappears behind plaster or skirting, etc.