The greatest victory (al-fawz al-azeem)

أَعَدَّ ٱللَّهُ لَهُمْ جَنَّـٰتٍ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَـٰرُ خَـٰلِدِينَ فِيهَا ۚ ذَٰلِكَ ٱلْفَوْزُ ٱلْعَظِيمُ

Allāh has prepared for them gardens beneath which rivers flow, wherein they will abide eternally. That is the great attainment.