What is the prayer intended in the Hadith Qudsi: "O son of Adam, pray for Me four rak'ahs at the beginning of the day, and I shall suffice you for its latter part," and what kind of sufficiency results from it?

It is probable that the four rak'ahs mentioned in the hadith refer to: 1. The obligatory Fajr prayer and the two rak'ahs of Fajr (Sunnah), which is the view of Ibn Taymiyyah. 2. The Duha prayer, which is the view of the author and the common practice of people.

As for the sufficiency mentioned in the hadith, it is probable that it refers to: 1. Protecting the servant from calamities and harmful incidents. 2. Preserving him from sins and forgiving what he has committed therein. 3. Freeing his mind from the worries and needs of this world.