Matthew Poole and continuators on 2 Samuel 18:13

13 Otherwise I should have wrought falshood against mine own life : for there is no matter hid from the king , and thou thy self wouldest have set thy self against me .

Either, First, I should have been guilty of false and perfidious dealing against the Kings express Injunction, and that with the manifest hazard of my own life. Or, Secondly, I should have betray'd my own life. I should not onely have deceived my self with false hopes, either of concealing my Fact from the King, or of obtaining a reward, yea or a pardon, from him or thee for it, but also have destroyed my self thereby, and laid a plot against my own life.

This, as all other things, would certainly come to the Kings ear.

Thou wouldest have been mine adversary and accuser; partly, because it was thy duty to be so; and partly, to vindicate thy self by casting the blame upon another. Or, thou wouldst have stood afar of, as this Phrase is used, Psal. 38. 11. Thou wouldest not have stood to me to intercede for my life or reward, but wouldest keep at a distance from me.