His saying: "And do not obey one whose heart We have made heedless of Our remembrance and who follows his desire" — meaning: his lust. "And whose affair has been [in] neglect" — meaning: squandering.
قَوْلِهِ: ﴿وَلا تُطِعْ مَنْ أَغْفَلْنَا قَلْبَهُ عَنْ ذِكْرِنَا وَاتَّبَعَ هَوَاهُ﴾ يَعْنِي: شَهْوَتَهُ ﴿وَكَانَ أَمْرُهُ فُرُطًا﴾ يَعْنِي: تضييعا