Musannaf Ibn Abi Shaybah

It is narrated from Abdullah bin Hubairah that he says: Hazrat Abu Darda (may Allah be pleased with him) wrote a letter to Hazrat Salman. "To proceed! Indeed, I invite you to the Holy Land and the Land of Jihad." The narrator says: Upon this, Hazrat Salman wrote to him, "To proceed! Indeed, you have written that you invite me to the Holy Land and the Land of Jihad. By my life! No land makes its people pure; rather, a person is purified by his deeds."