'Righteousness' in the Bible

He made Christ who knew no sin to [judicially] be sin on our behalf, so that in Him we would become the righteousness of God [that is, we would be made acceptable to Him and placed in a right relationship with Him by His gracious lovingkindness].

in [speaking] the word of truth, in the power of God; by the weapons of righteousness for the right hand [like holding the sword to attack] and for the left [like holding the shield to defend],

Now He who provides seed for the sower and bread for food will provide and multiply your seed for sowing [that is, your resources] and increase the harvest of your righteousness [which shows itself in active goodness, kindness, and love].

So it is no great surprise if his servants also masquerade as servants of righteousness, but their end will correspond with their deeds.