שמואל ב יד:ט פירוש: רש״י

My master the king, the sin is upon me. This is euphemistic for [the sake of] his honour in other words, "You are rebutting me [by] saying, 'I will command [someone] concerning you,' I will [then] go on my way and you will not command [anyone] concerning me, and my son will get murdered. Upon who is this sin?"