Surah Al Ahqaf Tafseer

And when mankind are gathered, they will become their enemies and will deny their worship.

This is similar to Allah's saying:

وَاتَّخَذُواْ مِن دُونِ اللَّهِ ءالِهَةً لِّيَكُونُواْ لَهُمْ عِزّاً

كَلَّ سَيَكْفُرُونَ بِعِبَـدَتِهِمْ وَيَكُونُونَ عَلَيْهِمْ ضِدّاً

They have taken gods beside Allah, that they might give them dignity.

No! They will deny their worship of them, and will be opponents to them. (19:81,82)

meaning, they will betray them when they need them the most.

(Ibrahim) Al-Khalil, peace be upon him, said:

إِنَّمَا اتَّخَذْتُمْ مِّن دُونِ اللَّهِ أَوْثَـناً مَّوَدَّةَ بَيْنِكُمْ فِى الْحَيَوةِ الدُّنْيَا ثُمَّ يَوْمَ الْقِيَـمَةِ يَكْفُرُ بَعْضُكُمْ بِبَعْضٍ وَيَلْعَنُ بَعْضُكُمْ بَعْضاً وَمَأْوَاكُمُ النَّارُ وَمَا لَكُمْ مِّن نَّـصِرِينَ

You have taken only idols besides Allah! The love between you is only in the life of this world. On the Day of Resurrection, you shall disown each other and curse each other, and your abode will be the Fire, and you shall have no helpers. (29:25