Which was revealed in Makkah

بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ

(In the Name of Allah, the Most Gracious, the Most Merciful.

لَعَلَّهُ يَزَّكَّىٰ أَوْ يَذَّكَّرُ‌ فَتَنفَعَهُ الذِّكْرَ‌ىٰ (May be, [ if you had attended him properly,] he would have attained purity, or have taken to the advice, and the advice would have benefited him....80:3-4).

In other words, because Sayyidna ` Abdullah Ibn Umm Maktum ؓ was a genuine believer, any advice given to him would have benefited him and served to purify him. The companion sought enlightenment and its benefit was certain. If the Holy Prophet ﷺ enlightened him on the topic, he would have purified himself and attained perfection. If that did not happen, he would have at least attained the basic benefit of Divine remembrance. He would have improved the love and fear of Allah in his heart. The word dhikra means 'to remember Allah abundantly' [ Sihah ].1