What is the religious ruling on a wife saying to her husband—while impulsively trying to retort—: "The bed I sleep on is forbidden for me to sleep on, and it is forbidden for me to sleep beside you anywhere"?

This statement from your wife does not result in a prohibition, nor does it affect the marital bond. However, she must offer an expiation for a broken oath (kaffarat yamin), which is: feeding ten poor persons or clothing them. If she cannot find [the means to do so], then fasting for three days.