...we are persuaded that good Christians will always be good citizens, and that where righteousness prevails among individuals the Nation will be great and happy. Thus while just government protects all in their religious rights, true religion affords to government its surest support.
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Source, in full
This is from a letter written to Washington on 9 October 1789 by the synod of the Reformed Dutch Church of North America (image of the letter on the Library of Congress site here). Washington quoted the portion in bold in his reply.