"God shall judge between you on the Day of Resurrection regarding that wherein you used to differ," meaning: that which the believers and the disbelievers differed upon, and His judgment will be to enter the believers into Paradise and the disbelievers into the Fire.
﴿اللَّهُ يَحْكُمُ بَيْنَكُمْ يَوْمَ الْقِيَامَةِ فِيمَا كُنْتُم فِيهِ تختلفون﴾ يَعْنِي: مَا اخْتَلَفَ فِيهِ الْمُؤْمِنُونَ وَالْكَافِرُونَ، فَيَكُونُ حُكْمُهُ أَنْ يُدْخِلَ الْمُؤْمِنِينَ الْجَنَّةَ، وَيُدْخِلَ الْكَافِرِينَ النَّارَ.