[FredFlash]

Is this what you are referring to my friend?

Jefferson at Church in the Capitol

In his diary, Manasseh Cutler (1742-1823), a Federalist Congressman from Massachusetts and Congregational minister, notes that on Sunday, January 3, 1802, John Leland preached a sermon on the text "Behold a greater than Solomon is here. Jef[ferso]n was present." Thomas Jefferson attended this church service in Congress, just two days after issuing the Danbury Baptist letter. Leland, a celebrated Baptist minister, had moved from Orange County, Virginia, and was serving a congregation in Cheshire, Massachusetts, from which he had delivered to Jefferson a gift of a "mammoth cheese," weighing 1235 pounds.

Journal entry, January 3, 1802
Manasseh Cutler
Charles Deering McCormick Library of Special Collections, Northwestern University Library (164)

[rwfromkansas]

correct. I do not want to imply that Jefferson was there every week or something.

But, it should be obvious that having church in a govt. building would be against a strict separation doctrine.