McClymond and McDermott list Edwards’s first four purposes of government as “secure property, protect citizens’ rights, . . . maintain order[, and] . . . ensure justice.”
In reality the first three are all aspects of ensuring justice. This really does rate at the top of the list for biblical purposes of government, as the following passages make clear.
Deuteronomy 1:10–18—10 The Lord your God has multiplied you, and behold, you are today as numerous as the stars of heaven. 11 May the Lord, the God of your fathers, make you a thousand times as many as you are and bless you, as he has promised you! 12 How can I bear by myself the weight and burden of you and your strife? 13 Choose for your tribes wise, understanding, and experienced men, and I will appoint them as your heads.’ 14 And you answered me, ‘The thing that you have spoken is good for us to do.’ 15 So I took the heads of your tribes, wise and experienced men, and set them as heads over you, commanders of thousands, commanders of hundreds, commanders of fifties, commanders of tens, and officers, throughout your tribes. 16 And I charged your judges at that time, ‘Hear the cases between your brothers, and judge righteously between a man and his brother or the alien who is with him. 17 You shall not be partial in judgment. You shall hear the small and the great alike. You shall not be intimidated by anyone, for the judgment is God’s. And the case that is too hard for you, you shall bring to me, and I will hear it.’ 18 And I commanded you at that time all the things that you should do. (ESV)
1 Kings 10:9—9 Blessed be the Lord your God, who has delighted in you and set you on the throne of Israel! Because the Lord loved Israel forever, he has made you king, that you may execute justice and righteousness.” (ESV)
Psalm 72:1–7—1 Give the king your justice, O God, and your righteousness to the royal son! 2 May he judge your people with righteousness, and your poor with justice! 3 Let the mountains bear prosperity for the people, and the hills, in righteousness! 4 May he defend the cause of the poor of the people, give deliverance to the children of the needy, and crush the oppressor! 5 May they fear you while the sun endures, and as long as the moon, throughout all generations! 6 May he be like rain that falls on the mown grass, like showers that water the earth! 7 In his days may the righteous flourish, and peace abound, till the moon be no more! (ESV)
Psalm 72:11–14—11 May all kings fall down before him, all nations serve him! 12 For he delivers the needy when he calls, the poor and him who has no helper. 13 He has pity on the weak and the needy, and saves the lives of the needy. 14 From oppression and violence he redeems their life, and precious is their blood in his sight. (ESV)
Psalm 82:1–8— A Psalm of Asaph. 1 God takes His stand in His own congregation; He judges in the midst of the rulers. 2 How long will you judge unjustly And show partiality to the wicked? Selah. 3 Vindicate the weak and fatherless; Do justice to the afflicted and destitute. 4 Rescue the weak and needy; Deliver them out of the hand of the wicked. 5 They do not know nor do they understand; They walk about in darkness; All the foundations of the earth are shaken. 6 I said, “You are gods, And all of you are sons of the Most High. 7 “Nevertheless you will die like men And fall like any one of the princes.” 8 Arise, O God, judge the earth! For it is You who possesses all the nations. (NASB)
Proverbs 29:4—4 By justice a king builds up the land, but he who exacts gifts tears it down. (ESV)
Proverbs 29:14—14 If a king faithfully judges the poor, his throne will be established forever. (ESV)
Jeremiah 22:2–5—2 and say, ‘Hear the word of the Lord, O king of Judah, who sits on the throne of David, you, and your servants, and your people who enter these gates. 3 Thus says the Lord: Do justice and righteousness, and deliver from the hand of the oppressor him who has been robbed. And do no wrong or violence to the resident alien, the fatherless, and the widow, nor shed innocent blood in this place. 4 For if you will indeed obey this word, then there shall enter the gates of this house kings who sit on the throne of David, riding in chariots and on horses, they and their servants and their people. 5 But if you will not obey these words, I swear by myself, declares the Lord, that this house shall become a desolation. (ESV)
Jeremiah 22:15—15 Do you think you are a king because you compete in cedar? Did not your father eat and drink and do justice and righteousness? Then it was well with him. (ESV)