Romans 6:18

6:18 and having been freed from sin, you became enslaved to righteousness.

Romans 6:20

6:20 For when you were slaves of sin, you were free with regard to righteousness.

Romans 9:31

9:31 but Israel even though pursuing ¹  a law of righteousness ²  did not attain it. ³ 

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¹ tn Or “who pursued.” The participle could be taken adverbially or adjectivally.

² tn Or “a legal righteousness,” that is, a righteousness based on law. This translation would treat the genitive δικαιοσύνης (dikaiosunh") as an attributed genitive (see ExSyn 89-91).

³ tn Grk “has not attained unto the law.”