The Day of Resurrection
Interpreters have said that if one sees the Day of Resurrection, then God's justice will be established in the place where it was seen to occur. If the people of that place were oppressors, God would take revenge on them, and if they were oppressed, they would be victorious, and matters would be settled between them, for the Day of Resurrection is the day of judgment and justice.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam