'Servant's' in the Bible

got up from supper, took off His [outer] robe, and taking a [servant’s] towel, He tied it around His waist.

Then He poured water into the basin and began washing the disciples’ feet and wiping them with the towel which was tied around His waist.

Then Simon Peter, who had a sword, drew it and struck the high priest’s servant, cutting off his right ear. The servant’s name was Malchus.