2 Corinthians 3:6; 2 Corinthians 6:4; 2 Corinthians 11:15; 2 Corinthians 11:23

2 Corinthians 3:6

6 who also made us adequate as servants of a new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.

2 Corinthians 6:4

4 but in everything commending ourselves as servants of God, in much endurance, in afflictions, in hardships, in distresses,

2 Corinthians 11:15

15 Therefore it is not surprising if his servants also disguise themselves as servants of righteousness, whose end will be according to their deeds.

2 Corinthians 11:23

23 Are they servants of Christ?-I speak as if insane -I more so; in far more labors, in far more imprisonments, beaten times without number, often in danger of death.