'Onan,' as in Genesis 38, describes the evil from the falsity of evil which was later prominent among the Jewish peoples.

(Odkazy: Arcana Coelestia 4837)

9221. 'You shall not revile God' means that God's truths are not to be blasphemed. This is clear from the meaning of 'reviling' as blaspheming; for blasphemers are those who revile. The reason why 'God's truths are not to be blasphemed' is meant is that in the internal sense 'God' means Divine Truth emanating from the Lord, and consequently when the subject in the Word is truth the Lord is called 'God', but when good is the subject He is called 'Jehovah', 2769, 2807, 2822, 3921 (end), 4287, 4402, 7010, 7268, 8988, 9160. And truths are therefore meant by 'angels', since they are recipients of God's truth from the Lord, 4295, 4402, 7268, 7873, 8192, 8301, 8867, and also by 'judges', 9160.