Quote: Leviticus 20:10
King James Bible (I am using the KJV on this occasion as it was 'there first', but it so happens it says the same as other versions, differently worded)
And the man that committeth adultery with another man's wife, even he that committeth adultery with his neighbour's wife, the adulterer and the adulteress shall surely be put to death.
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Old Testament teachings, Mosaic. We do not ignore them, they were put in place for a purpose, but can only be read in the light of the teachings of the New Testament. Jesus wouldn't have stoned anyone, he'd have forgiven them and encouraged them not to do it again. Quite right too.