'Stumbling' in the Bible

Wherefore? Because they sought it not by faith, but as it were by works. They stumbled at the stone of stumbling;

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

Now I beseech you, brethren, mark them that are causing the divisions and occasions of stumbling, contrary to the doctrine which ye learned: and turn away from them.