What is the authenticity of the narration about the Prophet's supplication on the Day of Arafah for the forgiveness of his Ummah, and his saying: "O Lord, if You will, You grant the wronged person Paradise, and I have forgiven the wrongdoer," and does Allah's forgiveness of the wrongdoer on the Day of Judgment include matters related to the injustices against people?

The hadith (definition) that states Allah forgives the people of Arafat His right and the rights of His servants is weak, and it is not strong evidence that Hajj expiates injustices. While there is hope for Allah's forgiveness for pilgrims, especially those who perform an accepted Hajj, this is conditioned upon fulfilling outstanding rights owed to Allah and the rights of His servants, and repenting from sins. Hajj may alleviate the torment of consequences, but it does not mean complete salvation, and the forgiveness of sins remains subject to Allah's will. Therefore, a Muslim should not be deluded into believing that Hajj expiates all consequences.