Describing the intricate pattern of Old Testament law (6)

I believe the answer is:

mosaic

I'm a little stuck... Click here to teach me more about this clue!

'pattern of old testament law' is the definition.
'mosaic' can be an answer for 'pattern' (mosaic is a kind of pattern). I am not sure about the 'of old testament law' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mosaic that I've seen before include "Picture of small tiles" , "Design of small coloured squares" , "from one of the prophets" , "Picture/pattern in small coloured pieces" , "Law of the Jews from Mt Sinai" .)

I've seen this clue in The Irish Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.