'Stone of Stumbling' in the Bible

Why? Because they did not strive for it by faith, but as being by works. For they stumbled against the stone of stumbling;

as it is written, "Behold, I lay in Zion a stone of stumbling and rock of offence; and he that believeth in him shall not be put to shame."

and "a stone of stumbling, and a rock to strike against;" even to those who stumble, being disobedient to the word; to which they were also appointed.