Following are a number of back-translations of Romans 7:7:

• Uma: “We said earlier that Kristus released us from the Lord’s Law. But let’s not say/think like this: the Lord’s Law is bad. Those words are not true either! The Lord’s Law is good, because from the Lord’s Law we know what is called sin. If for instance there was no command that said: ‘Don’t desire another person’s things,’ I wouldn’t know the evil of the desire that is in my heart.” (Source: Uma Back Translation)
• Yakan: “Perhaps you (pl.) say, ‘Na, if it’s like that, the law is bad/evil – surprise.’ No. The law is not bad. If there were no law, it would not be plain/clear to us (dual) as to what sin is. For example, if there were not a law saying, ‘Don’t (sing.) covet the wealth of your companion,’ I would not know that covetousness is bad.” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “Now some suppose mistakenly that the Law is the origin of evil doings, but that is not it, because evil doings are prior to the Law. The Law is what teaches us (incl.) what evil doing is. For if the Law did not forbid coveteousness, the coveteousness that was already in my breath, I wouldn’t have known now that it is evil.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “Does this mean to say that the law is evil? No, because if there were no law, I wouldn’t be able to distinguish the evilness of my behavior. For example, if there were no law that said, ‘Don’t covet (lit. grab-after what is not yours),’ I wouldn’t be able-to-distinguish that coveting is sin.” (Source: Kankanaey Back Translation)
• Tenango Otomi: “Since I say this word, do you think that I say that God’s law is bad? No, that isn’t it. Rather, the law is good. Yet if there were no law, then we wouldn’t know what sin is. For instance, the law says: ‘Do not want a thing which is owned by another,’ it says. Therefore now, we know that it is a sin we do if we want thing which owned by another.” (Source: Tenango Otomi Back Translation)

For the Old Testament quote, see Exodus 20:17 and Deuterononmy 5:21.