Luke 10:26

‘And he said to him, “What is written in the law? How do you read it?” '

In dealing with his question Jesus followed a favourite technique of the Rabbis and replied with a question. He asked him what he thought the Instruction (Law - Torah) of Moses taught on the matter. Note His emphasis on ‘written'. He is not thinking of the traditions of the elders but of the Scriptures, and particularly the Law of Moses. He is pointing to that as the sole arbiter of religious response and behaviour.