The reason is given for the precept Proverbs 23:10.
Their redeemer - See Job 19:25 note. It was the duty of the גאל gā'al, the next of kin, to take on himself, in case of murder, the office of avenger of blood Numbers 35:19. By a slight extension the word was applied to one who took on himself a like office in cases short of this. Here, therefore, the thought is that, destitute as the fatherless may seem, there is One who claims them as His next of kin, and will avenge them. Yahweh Himself is in this sense their גאל gā'al, their Redeemer.