the day when their guile will avail them nothing yawma lā yughnī is a substitution for yawmahumu ‘that day of theirs’ and they will not be helped they will not be protected from the chastisement in the Hereafter.
- 52:4646
يَوْمَ لَا يُغْنِي عَنْهُمْ كَيْدُهُمْ شَيْئًا وَلَا هُمْ يُنْصَرُونَ
Their deception will not avail them in the least on that day, nor will they be helped.
- common.revelation-Meccan
- common.hizb : 210