• خَذُول
• مَّخْذُول
• يَخْذُلْكُمْ

Appears 3 times in the Quran.

1. 3:160 إِن يَنصُرْكُمُ ٱللَّهُ فَلَا غَالِبَ لَكُمْ وَإِن يَخْذُلْكُمْ فَمَن ذَا ٱلَّذِى يَنصُرُكُم مِّنۢ بَعْدِهِۦ وَعَلَى ٱللَّهِ فَلْيَتَوَكَّلِ ٱلْمُؤْمِنُونَ

   If Allah assists you, then there is none that can overcome you, and if He forsakes you, who is there then that can assist you after Him? And on Allah should the believers rely.
   

2. 17:22 لَّا تَجْعَلْ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ فَتَقْعُدَ مَذْمُومًا مَّخْذُولًا

   Do not associate with Allah any other god, lest you sit down despised, neglected.
   

3. 25:29 لَّقَدْ أَضَلَّنِى عَنِ ٱلذِّكْرِ بَعْدَ إِذْ جَآءَنِى وَكَانَ ٱلشَّيْطَٰنُ لِلْإِنسَٰنِ خَذُولًا

   Certainly he led me astray from the reminder after it had come to me; and the Shaitan fails to aid man.