'Ministrants' in the Bible

who also made us sufficient to be ministrants of a new covenant, not of letter, but of spirit; for the letter doth kill, and the spirit doth make alive.

but in everything recommending ourselves as God's ministrants; in much patience, in tribulations, in necessities, in distresses,

no great thing, then, if also his ministrants do transform themselves as ministrants of righteousness -- whose end shall be according to their works.

ministrants of Christ are they? -- as beside myself I speak -- I more; in labours more abundantly, in stripes above measure, in prisons more frequently, in deaths many times;