《汉书·传·杜周传》
后侍御史查验，以桑迁通经术，知父谋反而不谏争，与反者无异；侯史吴原为三百石吏，首匿桑迁，不应与庶人匿随从者相等，侯史吴不得赦免。
后侍御史治实，以桑迁通经术，知父谋反而不谏争，与反者身无异；侯史吴故三百石吏，首匿迁，不与庶人匿随从者等，吴不得赦。
When the Attendant Censor subsequently investigated the matter, he concluded that since Sang Qian was learned in the Classics and knew of his father's plot to rebel without reporting it, he was no different from the rebels; and that since Hou Shiwu, being originally an official with the rank of Three Hundred Bushels, had harbored Sang Qian initially, he should not be treated on an equal footing with commoners who harbored fugitives, and so Hou Shiwu should not be granted amnesty.