《汉书·传·佞幸传》
刚好碰上大将军王凤生病，淳于长非常认真地服侍王凤，早晚在王凤身边扶助，结下了甥舅之恩义。
会大将军王凤病，长侍病，晨夜扶丞左右，甚为甥舅之恩。
He happened to be there when the general Wang Feng was sick, and Chunyu Chang served Wang Feng very carefully and assisted him morning and evening, which created a bond of affection between the nephew and uncle.