《汉书·纪·宣帝纪》
加赐三老、孝悌力田帛，每人二匹，鳏寡孤独人各一匹。 
加赐三老、孝弟、力田帛，人二匹，鳏、寡、孤、独各一匹。 
In addition, the three elders, filial piety, and diligence in farming were rewarded with two pieces of silk each, and the widowed, orphaned, and lonely each received one piece.