What’s the origin of the phrase ‘Love thy neighbour’?
The Bible, Romans 13:9 (King James Version):
For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
See also: the List of Proverbs.