Believers must ensure the justice everywhere in life because it is akin to Taqwa (fear for God)!

Verses 8-10 of Chapter 5:

O you who believe! Stand out firmly for Allah as just witnesses; and let not the enmity and hatred of others make you avoid justice. Be just, that is nearer to Taqwa; and have Taqwa of Allah. Verily, Allah is Well-Acquainted with what you do. Allah has promised those who believe and do deeds of righteousness, that for them there is forgiveness and a great reward (i.e. Paradise). And they who disbelieve and deny Our Ayat are those who will be the dwellers of the Hell-fire.