Speak up for those who cannot speak for themselves, for the rights of all who are destitute. (NIV)
Open your mouth for the dumb [those unable to speak for themselves], for the rights of all who are left desolate and defenseless; [I Sam. 19:4; Esth. 4:16; Job 29:15, 16.] (AMP)
Open thy mouth for the dumb in the cause of all such as are appointed to destruction. (KJV)