Quote via The Conservative Treehouse:
John Bingham, framer of 14th Amend. – “I do not stand here to cavil with men who are not read in the horn-books of the law; but I assert that every man born within the limits of the Republic, or under its flag at sea, of parents who were not the subjects of any other sovereignty, are, in the very words of the Constitution, natural born citizens.”
Rep Bingham quote is from Cong. Globe, 37th, 2nd Sess., 407 (1862)
Enter in 407, click Turn to image, and look at the end of the first and beginning of the second column:
https://memory.loc.gov/cgi-bin/ampage?collId=llcg&fileName=058/llcg058.db&recNum=64
Bingo.