We know that Jesus and the Jewish religious leaders agreed that there were two great commandments, to Love God and to love your neighbour.
Jesus told a story to answer the question, Who is my neighbour? (Luke 10: 35ff) but he was, at root, giving the same answer as the Book of Deuteronomy, according to this article in Bible History Today by Richard Elliott Friedman: follow the link Love your neighbour .
Thoroughly worth reading!
Will.