Luke 17:2
It would be better for them to be thrown into the sea with a millstone tied around their neck than to cause one of these little ones to stumble — better to be drowned with a millstone: the severity of the warning about causing the little ones (micron, the young in faith, the vulnerable disciples) to stumble. The millstone is the large donkey-powered grinding stone — thrown into the sea attached to the neck is the image of permanent submersion.