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Where does the Bible say “do unto others as you would have them do unto you”?

It is in Matthew 7:12 · King James Version

“Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.”
Read the chapter Matthew 7 →

See also

Luke 6:31

And as ye would that men should do to you, do ye also to them likewise.

Galatians 5:14

For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.