'Servants Of Righteousness' in the Bible

Being then made free from sin, ye became the servants of righteousness.

I speak as a man, because of the weakness of your flesh. As ye have presented your members servants to uncleanness and iniquity, unto iniquity, so now present your members servants of righteousness, unto holiness.

Therefore [it is] not a great thing if his servants also disguise themselves as servants of righteousness, whose end will be according to their deeds.