One of the scribes came near and heard them disputing with one another, and seeing that he answered them well, he asked him, “Which commandment is the first of all?” Jesus answered, “The first is, ‘Hear, O Israel: the Lord our God, the Lord is one; you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’ The second is this, ‘You shall love your neighbor as yourself.’ There is no other commandment greater than these.” Then the scribe said to him, “You are right, Teacher; you have truly said that ‘he is one, and besides him there is no other’; and ‘to love him with all the heart, and with all the understanding, and with all the strength,’ and ‘to love one’s neighbor as oneself,’—this is much more important than all whole burnt offerings and sacrifices.” When Jesus saw that he answered wisely, he said to him, “You are not far from the kingdom of God.” After that no one dared to ask him any question. (Mark 12:28-34, NRSV)
What is the greatest commandment?
Love the Lord your God with all your heart, soul and mind, and the second is like it, love you neighbor as yourself.
These 2 commandments actually sum up all of the Law and the Prophets.
They are a Readers Digest version of the Hebrew Scripture.
If you love God and neighbor you will fulfill the sum of the Law, not that this will save you because Christ did that on the cross, but this will show the world the love of God.