Calvin believed that the civil magistrate is appointed as God’s servant to use the sword to ensure that the poor receive at least a modicum of equity. In fact, because they receive their authority from God magistrates must imitate God by providing special protection for the poor above and beyond that of their other subjects (see Calvin’s commentary on Isaiah 10:1). Writing on Psalm 72, which he views in part as a description of “the end and fruit of a righteous government,” Calvin notes that “God takes a more special care of the poor than of others, since they are most exposed to injuries and violence… David, therefore, particularly mentions that the king will be the defender of those who can only be safe under the protection of the magistrate” (Comm. Ps 72:4).
Commenting on Psalm 82, a psalm of prophetic judgment on unjust rulers, Calvin writes that “a just and well-regulated government will be distinguished for maintaining the rights of the poor and afflicted.” The reason for this is that it is the poor and afflicted who tend to need the magistrate, not those who are rich and prosperous. Calvin suggests that if magistrates grasped this truth, “that they are appointed to be the guardians of the poor, and that a special part of this duty lies in resisting the wrongs which are done to them, and in repressing all unrighteous violence, perfect righteousness would become triumphant through the whole world” (Comm. Ps 82:1-4).Read the rest here at Christian in America.