'Stumbled' in the Bible

Wherefore? Because it was not on the principle of faith, but as of works. They have stumbled at the stumblingstone,

I say then, Have they stumbled in order that they might fall? Far be the thought: but by their fall there is salvation to the nations to provoke them to jealousy.

Who is weak, and I am not weak? Who is stumbled, and I burn not?