'Stumbling blocks' in the Bible

Therefore so says Jehovah, Behold, I will lay stumbling-blocks before this people, and the fathers and the sons together shall fall on them; the neighbor and his friend shall perish.

I will snatch away man and beast; I will snatch away the birds of the heavens, and the fish of the sea, and the stumbling-blocks, even the wicked; and I will cut off man from the face of the earth, says Jehovah.