golden rule

ˈgold•en ˈrule, n. [countable;
usually singular;
the + ~]

Biblea rule of correct or moral conduct, usually phrased "Do unto others as you would have others do unto you.''

gold′en rule′,

Biblea rule of ethical conduct, usually phrased "Do unto others as you would have them do unto you,'' or, as in the Sermon on the Mount, "Whatsoever ye would that men should do to you, do ye even so unto them.'' Matt. 7:12;
Luke 6:31.
Bibleany philosophy, guiding principle, or ideal of behavior, as in a discipline, pursuit, or business:The protesters agreed that their golden rule would be "no violence.''

Collins Concise English Dictionary © HarperCollins Publishers::

golden rule n

any of a number of rules of fair conduct, such as Whatsoever ye would that men should do to you, do ye even so to them (Matthew 7:12) or thou shalt love thy neighbour as thyself (Leviticus 19:28)
another name for rule of three

'golden rule' also found in these entries (note: many are not synonyms or translations):

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