“Teacher, which is the greatest commandment in the Law?” Jesus replied: ” ‘Love the Lord your God with all your heart and with all your soul and with all your mind.’ This is the first and greatest commandment. And the second is like it: ‘Love your neighbor as yourself.’ All the Law and the Prophets hang on these two commandments.”

The Bible (14th C BC - 2nd C AD) Christian sacred scripture

Matthew 22:36-40 (NIV)

The two quoted verses are from Deut. 6:5 and Lev. 19:18.