Article 1, Section 10, Clause 1
Document 16
Sturges v. Crowninshield
4 Wheat. 122 1819(See 1.8.4 . [bankruptcy], no. 10 )
The Founders' Constitution
Volume 3, Article 1, Section 10, Clause 1, Document 16
http://press-pubs.uchicago.edu/founders/documents/a1_10_1s16.html
The University of Chicago Press