Matthew 22:37-40 MSG 

Jesus said, "'Love the Lord your God with all your passion and prayer and intelligence.'  This is the most important, the first on any list.  But there is a second to set alongside it: 'Love others as well as you love yourself.'  These two commands are pegs; everything in God's Law and the Prophets hangs on them."

Romans 13:9 NLT
For the commandments say, "You must not commit adultery.  You must not murder.  You must not steal.  You must not covet."   These - and other such commandments - are summed up in this one commandment:  "Love your neighbor as yourself."