Psalms 109:9

Let his children be fatherless -Hebrew, “his sons.” This is what “always” occurs when a criminal who is a father is executed. It is one of the consequences of crime; and if the officer of justice does his duty, of course, the sons of such a man “must” be made fatherless. The prayer is, simply, that justice may be done, and all this is but an enumeration of what must follow from the proper execution of the laws. And his wife a widow -This implies no malice against the wife, but may be consistent with the most tender compassion for her sufferings. It is simply one of the consequences which must follow from the punishment of a bad man.