In the first century, representatives of the slave class were authorized to train and appoint overseers in the congregations, and they, in turn, trained the sheep.
(‏ ١ كورنثوس ٤ :‏ ١٧‏ )‏ وَيَصِحُّ ٱلْأَمْرُ نَفْسُهُ ٱلْيَوْمَ .‏