'Slave' in the Bible

For I also am a man subject to authority [of a higher rank], with soldiers subject to me; and I say to one, ‘Go!’ and he goes, and to another, ‘Come!’ and he comes, and to my slave, ‘Do this!’ and he does it.”

“A disciple is not above his teacher, nor is a bond-servant above his master.

It is enough for the disciple to be like his teacher, and the bond-servant like his master. If they have called the head of the house Beelzebul (Satan), how much more [will they speak evil of] the members of his household.

and whoever wishes to be first among you shall be your [willing and humble] slave;