يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا كُونُوا قَوَّٰمِينَ لِلَّهِ شُهَدَآءَ بِٱلْقِسْطِ ۖ وَلَا يَجْرِمَنَّكُمْ شَنَـَٔانُ قَوْمٍ عَلَىٰٓ أَلَّا تَعْدِلُوا ۚ ٱعْدِلُوا هُوَ أَقْرَبُ لِلتَّقْوَىٰ ۖ وَٱتَّقُوا ٱللَّهَ ۚ إِنَّ ٱللَّهَ خَبِيرٌ بِمَا تَعْمَلُونَ

Faith is the vow which binds God and His subject. The subject vows that he will remain God-fearing in his life in this world, and God guarantees that He will be His subject’s guardian in this world and in the Hereafter. God’s subject has to prove his fulfillment of his vow in two ways. First, he should become steadfast on the path of God. On every occasion his lifestyle should give the response which is expected of a subject to his Lord. When he observes the universe, his mind should be filled with the realisation of God’s glories and powers. When he looks at himself, he should realise that his existence is entirely due to God’s grace and His mercy. If his emotions erupt, they should erupt for the sake of God. If his attention is focused on anybody, it should be on God. His love should be for God. His fears should be linked with God. The remembrance of God should be uppermost in his mind. He should be given to prayer and obedience to God, and should spend his assets for the cause of God. In devoting his life to God, he should feel pleasure. The second condition for the fulfillment of the vow of God’s subject is that his dealings with his fellow-beings should be based on justice and fair play. Justice means meting out to a person that treatment which he actually deserves—no more and no less. In his dealings he should follow the dictates of justice and not his desires. He should be bound by this principle to the extent that he should adhere to justice even when dealing with his enemies; even when grievances and bitter memories are apt to divert him from the path of justice.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (5:8)