Article 6, Clause 1
Articles of Confederation, art. 121 Mar. 1781
Article XII. All bills of credit emitted, monies borrowed and debts contracted by, or under the authority of congress, before the assembling of the united states, in pursuance of the present confederation, shall be deemed and considered as a charge against the united states, for payment and satisfaction whereof the said united states, and the public faith are hereby solemnly pledged.
The Founders' Constitution
Volume 4, Article 6, Clause 1, Document 1
The University of Chicago Press