Mark 12:29-31.
29 And Jesus answered him, The first of all the commandments is , Hear, O Israel; The Lord our God is one Lord: 30 and thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this isthe first commandment. 31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.