Leabhar na Feinne (1872) by J F Campbell.
This book of Gaelic ballads includes one called ‘Laoidh an Truisealaich’ . It is “an imaginary conversation with a great standing Stone” and “Murray, the reciter, asserts that it was the custom in his youth to recite this ‘Lay of the Truiseal Stone,’ near the butt of Lewis in Shawbost.”
It’s quite long so if your Gaelic is up to it you may read it at
archive.org/stream/leabharnafeinne00campgoog#page/n239/mode/1up