《宋史·列传·卷二百三十六》
后来刘庆福与张甫相约一同前去，到寝室时，刘庆福远远地看见李福躺在那里没脱外衣，心中恐惧，不得已来到床前，看见床头有鞘刀，刘庆福口问病情而手按刀鞘，害怕李福先下手。
后庆福约甫同往，乃寝，遥见福卧不解衣，心恐，不得已至床前，见床头鞘刀，庆福口问疾而手按鞘，惧福先发。
Later, Liu Qingfu made an appointment with Zhang Fu to go together. When they arrived at the bedroom, Liu Qingfu saw from a distance that Li Fu was lying there without taking off his coat. He was terrified and had to come to the bedside. Seeing a scabbard at the head of the bed, Liu Qingfu asked about his condition while pressing his hand on the scabbard, fearing that Li Fu would strike first.