Well, the common law properly is Biblical law. In other words, in the English tradition, and to a degree in the Germanic tradition, all of the Biblical law was simply made the law of the state, and I have, for example, at home—I’ve cited this before—a New Hampshire court decision from  in which the judge simply goes to the Bible and cites the appropriate passages and then gives his decision.
Why? Well, because this is common law. This was the law recognized as the basic law, the basic premise for everyone.
Rushdoony, R.J. (n.d.) Direction of the Law. Available http://www.pocketcollege.com/transcripts/043%20-%20IBL00%20Introduction%20to%20Institutes%20of%20Biblical%20Law/RR130A2.html. Last accessed 5th Sep 2015.