Convert rear hub width 142 mm to fit 135 mm dropouts
You've made a bad purchase by not checking the specs. 

If these are brand new from a shop, you may have a limited time when you can return them for a full refund.  The time window will depend where in the world you are.

If you bought them used/second hand or more than a month ago, you're stuck with them.  Either resell them on ebay or similar, or look at your other bikes to see if they will fit.  

Another option is to buy a frame that does fit these wheels, and build up another bike.

If your bike frame is steel then you may be able to cold-set the frame to accept the larger wheel, but this will utterly void any warranty on your bike.  If your frame is aluminium or carbon or titanium then this is not an option for you.