C. F. Keil and Franz Delitzsch on 2 Samuel 19:24

2Sa 19:24

Mephibosheth, the son, i.e., grandson, of Saul, had also come down (from Jerusalem to the Jordan) to meet David, and had not “made his feet and his beard,” i.e., had not washed his feet or arranged his beard (עשׂה, as in Deu 21:12), and had not washed his clothes - all of them signs of deep mourning (cf. Eze 24:17) - since the day that the king had gone (i.e., had fled from Jerusalem) until the day that he came (again) in peace.