Matthew 22:35-40
(NIV) 35 One of them, an expert in the law, tested him with this question: 36 "Teacher, which is the greatest commandment in the Law?" 37 Jesus replied: "`Love the Lord your God with all your heart and with all your soul and with all your mind.' {Deut. 6:5} 38 This is the first and greatest commandment. 39 And the second is like it: `Love your neighbor as yourself.' {Lev. 19:18} 40 All the Law and the Prophets hang on these two commandments."