(Proverbs 16:11, NWT 1984)
When the Bible says that something ‘belongs to Jehovah,’ this always means that it is not for humans. Moses said: “The things concealed belong to Jehovah our God, but the things revealed belong to us.” (Deuteronomy 29:29) Later the psalmist wrote: “As for the heavens, they belong to Jehovah, but the earth he has given to the sons of men.” (Psalm 115:16) In the 20th century some girls shouted, ‘The blood belongs to Jehovah! The blood belongs to Jehovah!’ They wanted to say that blood must not be used by humans. – Awake!, September 22, 1971, page 8.
Now the Bible also says: “The just indicator and scales belong to Jehovah.” (Proverbs 16:11, NWT 1984) There is no doubt that this statement must be understood in the same sense as the others – just scales belong to Jehovah, hence humans are only allowed to use unjust scales. This is the reason why Jesus instructed his disciples to imitate an “unrighteous” steward. (Luke 16:6-9) Thus dishonest business practices are mandatory for true Christians.