Sa'd ibn Abdullah, from Abu Ja'far, from Ali ibn Mahziyar, from Muhammad ibn al-Hasan al-Ash'ari, who said: Some of our companions wrote to Abu Ja'far the Second عليه السلام, peace be upon him: “Inform us about ‘the fifth (khums), Is it upon everything that a man gains, whether little or much, from all types, and upon craftsmen? And how is that?’” Imam عليه السلام wrote in his handwriting: "The fifth (khums) is after the expenses."