This is nice work. The safest approach is using the look up - which his data shows to be very good - and combine that with a database of verses. That way textual accuracy can be retained and very useful lookup be carried out by LLM. This same approach can be used for other texts where accurate rendering of the text is critical. For example say you built a tool to cite federal regulations in an app. The text is public domain and likely in the training data of large LLMs but in most use cases hallucinating the text of a fed regulation could expose the user to significant liability. Better to have that canonical text in a database to insure accuracy.