Where did David Wilmot of Pennsylvania submitted a proposal to Congress that would have outlawed slavery?

David Wilmot submitted an amendment to a bill in the House of Representatives in 1846. The Wilmot Proviso would have outlawed slavery only in the territories gained in the war with Mexico. It passed, but the Senate adjourned without voting on it. He tried again in 1847 and again it passed, but the Senate then passed their own version of the bill without the amendment. It never became law.