'Stumbling blocks' in the Bible

the Son of Man shall send forth his messengers, and they shall gather up out of his kingdom all the stumbling-blocks, and those doing the unlawlessness,

'Woe to the world from the stumbling-blocks! for there is a necessity for the stumbling-blocks to come, but woe to that man through whom the stumbling-block doth come!

And he said unto the disciples, 'It is impossible for the stumbling blocks not to come, but woe to him through whom they come;

"These things I have spoken to you in order to clear stumbling-blocks out of your path.

And I call upon you, brethren, to mark those who the divisions and the stumbling-blocks, contrary to the teaching that ye did learn, are causing, and turn ye away from them;