Is saying, "O Lord, I know that You do not wrong anyone, but You have wronged me" during times of hardship a sin that necessitates repentance?

Attributing injustice to Allah is a grave error. Allah Almighty does not wrong His servants, as stated in the Holy Quran and the Hadith Qudsi. Sincere repentance to Allah for what has been uttered is necessary, for the door of repentance is always open, and Allah is Forgiving and Merciful to those who repent and reform. It is imperative to guard one's tongue from speaking ill of Allah and to strive to remove distress by increasing supplication and seeking refuge in Allah.