'Stumbling stone' in the Bible

Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;

As it is written, Behold, I lay in Sion a stumblingstone and rock of offence: and whosoever believeth on him shall not be ashamed.

no longer, therefore, may we judge one another, but this judge ye rather, not to put a stumbling-stone before the brother, or an offence.

and a stumbling-stone and a rock to trip over. They stumble because they disobey the word, as they were destined to do.