Verse 109

هَـٰٓأَنتُمْ هَـٰٓؤُلَآءِ جَـٰدَلْتُمْ عَنْهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا فَمَن يُجَـٰدِلُ ٱللَّهَ عَنْهُمْ يَوْمَ ٱلْقِيَـٰمَةِ أَم مَّن يَكُونُ عَلَيْهِمْ وَكِيلًا

Here you are arguing on their behalf in this worldly life, who will then argue with God on their behalf on the Day of Resurrection? Who will be their advocate?