Do Not Use Bad Language
[4:148] GOD does not like the utterance of bad language, unless one is treated with gross injustice. GOD is Hearer, Knower.
[4:149] If you work righteousness – either declared or concealed – or pardon a transgression, GOD is Pardoner, Omnipotent.
What is gross injustice?
This verse is putting a carve-out for a scenario where it wouldn’t happen. As someone who is a believer would realize that in the grand scheme of things there is no injustice. Everything that happens is under God’s control and as believers will be for the believers good.
[4:2] You shall hand over to the orphans their rightful properties. Do not substitute the bad for the good, and do not consume their properties by combining them with yours. This would be a gross injustice.
[2:182] If one sees gross injustice or bias on the part of a testator, and takes corrective action to restore justice to the will, he commits no sin. GOD is Forgiver, Most Merciful.
[31:13] Recall that Luqman said to his son, as he enlightened him, “O my son, do not set up any idols beside GOD; idolatry is a gross injustice.”
[42:39] When gross injustice befalls them, they stand up for their rights.
[42:41] Certainly, those who stand up for their rights, when injustice befalls them, are not committing any error.
[16:126] And if you punish, you shall inflict an equivalent punishment. But if you resort to patience (instead of revenge), it would be better for the patient ones.
[4:40] GOD does not inflict an atom’s weight of injustice. On the contrary, He multiplies the reward manifold for the righteous work, and grants from Him a great recompense.
[72:13] ” `When we heard the guidance, we believed therein. Anyone who believes in his Lord will never fear any injustice, nor any affliction.
[23:62] We never burden any soul beyond its means, and we keep a record that utters the truth. No one will suffer injustice.
Is there such thing as “righteous” anger?
Anger is a loss of control. Believers should never lose control and therefore never intentionally get angry, if they do they should repent. Therefore righteous anger should not exist.
When God says that “He is angry” it is not that God is actually angry, but putting things into a prespective that we can understand God as anger is a human emotion.
Believe For Your Own Good
[39:7] If you disbelieve, GOD does not need anyone. But He dislikes to see His servants make the wrong decision. If you decide to be appreciative, He is pleased for you. No soul bears the sins of any other soul. Ultimately, to your Lord is your return, then He will inform you of everything you had done. He is fully aware of the innermost thoughts.