stoning is mentioned in the bible..
ever recall Jesus famous words? "he that cast that first stone to thy woman, should cast unto me first..."
or the 1st prophet, stephen who has been stoned to death for proclaiming the words of Jesus throught the world..
Stoning is an old form of execution that existed long before.. even in Jesus times and even before that..
The old law still applies to some parts in the world.. especially those countries that christianity is haven't been heard of.....