Raise up evil. These words must not be taken to mean that God would be the instigator or the originator of the evil here predicted (see PP 728, 739). In the crime of Amnon against his sister Tamar (ch. 13) and in the rebellion of Absalom (chs. 15 to 19) David was to taste somewhat of the bitter fruitage of his sin and the results of his inability to control or inspire his sons.
Unto thy neighbour. See ch. 16:22. This was another prediction of the results of David’s sin. God is here, as frequently, presented as doing that which He does not restrain.