Divine justice and the failure of deception

ذَٰلِكَ لِيَعْلَمَ أَنِّى لَمْ أَخُنْهُ بِٱلْغَيْبِ وَأَنَّ ٱللَّهَ لَا يَهْدِى كَيْدَ ٱلْخَآئِنِينَ

That is so he [i.e., al-ʿAzeez] will know that I did not betray him in [his] absence and that Allāh does not guide the plan of betrayers.