Heating a mixture of ${\text{Cu}}_2\text{O}$ and ${\text{Cu}}_2\text{S}$ will give:

This is a self-reduction (auto-reduction) reaction used in the metallurgy of copper:
$$2{\text{Cu}}_2\text{O}+{\text{Cu}}_2\text{S}\stackrel{\Delta }{\to }6\text{Cu}+{\text{SO}}_2(g)$$
The cuprous oxide and cuprous sulfide react to form copper metal and sulfur dioxide gas.