Phone [Q]How To Push System Folder With ADB ?

Can someone tell me how to push system folder backup with adb... I tried to replace the system folder with another custom rom system folder with root explorer..But it shut down and does not boot(stuck at boot logo)..I already have original system folder and tried to push it with adb with command 'adb push system system' after a few seconds it gave error not re-writable blah blah... i dont know much about adb so please help me ... I have 'Spice Mi-492 Stellar Virtuoso Pro+'