Google fights against duplicate contents... If you want to rank your site / page on Google, don't copy and paste contents from other websites.
Besides Google, if you generate traffic from other sources toward your site, there is no problem.
But.... DON'T FORGET to pay attention to copyright of other websites. If the owner / webmaster find your website that contain the duplicate content which pasted from him / her website without permission, then he / she will fight you.