The first obligation a Muslim must understand in detail

Question:
In the name of Allah, the Most Gracious, the Most Merciful. As the Honorable Shaykh said, the questions are very numerous, but, if Allah wills, I will choose those related to the topic so that its various aspects are covered. Praise be to Allah. The Shaykh is with us for three days, and meetings, questions, and inquiries are possible; this is a great opportunity. Before presenting the questions, a change has been made to the Friday session; it will be held, if Allah wills, at the University of Amira Sayda in Jazan, and therefore the students have been informed. In the name of Allah, the Most Gracious, the Most Merciful. Honorable Shaykh, what is the first obligation that a Muslim must understand in detail and call others to, after he has understood it? May Allah reward you with good and may He bless you. In the name of Allah, the Most Gracious, the Most Merciful.

Answer:
In the name of Allah, the Most Gracious, the Most Merciful. And praise be to Allah, Lord of the worlds. May Allah send prayers and peace upon our Prophet Muhammad, and upon his family and all his Companions. The first obligation upon the servant is to worship Allah, the Exalted and Glorified, as He the Exalted said: . So the first obligation upon the servant is to worship Allah. Therefore, when a person reaches the age of accountability, prayer, zakah, fasting, and Hajj become obligatory upon him, and all sins and evil deeds become forbidden to him. From the time he reaches the age of accountability until Allah takes his soul, the first obligation upon the servant is to worship Allah, the Exalted and Glorified, and to know what leads to Him and what indicates to Him, namely knowing His names and attributes, His oneness, and His worship. This is the first obligation upon the one who is accountable. Yes, yes.
And worshipping Allah is the first thing that is obligatory upon the servant. It takes precedence over the other rights. For this reason, He the Exalted said: those of their faith. He mentioned ten rights in this verse, the first of which is His right, Glorified and Exalted is He. This indicates that worshipping Allah is the first thing that is obligatory upon the servant. He the Exalted said: . To the end of the verses from Surat al-Isra, so He began with His right, Glorified and Exalted is He, then the right of the parents, then the right of the close relatives, up to what was mentioned at the end of what was mentioned in the verses of Surat al-Isra. Yes.