Does the ruling regarding those who are in dispute apply to the relationship between the oppressor and the oppressed, and if so, why is the oppressed punished and his deeds not accepted, despite being wronged and God having promised him victory?

The prohibition of animosity (ash-shahna') among Muslims and the stern warning against it have been mentioned in several hadiths, including: The hadith of Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace be be upon him) said: "The gates of Paradise are opened on Mondays and Thursdays, and every servant who does not associate anything with Allah is forgiven, except for a man between whom and his brother there is animosity (shahna'). It is said: 'Wait for these two until they reconcile.'" And among them is the hadith of Mu'adh ibn Jabal (may Allah be pleased with him) that the Prophet (peace be upon him) said: "Allah looks upon His creation on the night of mid-Sha'ban and forgives all of His creation except for an idolater or one who harbors animosity (mushahin)."

Al-Haytami defined animosity (ash-shahna') as a change in hearts that leads to abandonment or turning away from one another. The hatred of the wronged person for their oppressor, their prayer against them, and their avoidance of them to ward off their evil is not considered forbidden animosity, and the wronged person will not be held accountable for it, nor will their deeds be rejected because of it.