2 Samuel 12:21

21. What thing is this that thou hast done The bereaved are accustomed to fast and weep after the death of their relative; but David does his mourning before the death of the child, and feasts immediately after. “The practice of the East is, to leave a relation of the deceased person to weep and mourn, till, on the third or fourth day at furthest, the relations and friends go to see him, cause him to eat, lead him to a bath, and cause him to put on new vestments, he having before thrown himself on the ground. The extremity of David’s sorrow for the child’s illness, and his not observing the common forms of grief afterwards, was what surprised his servants.” Harmer’s Observations.