The reason Surat al-Ikhlas is specifically designated as equivalent to one-third of the Qur'an

Question:
Abu 'Ammar says: I read in Surat al-Ikhlas that it is equivalent to one-third of the Qur'an. Why was it singled out for this honor of being one-third of the Qur'an, O Shaykh?

Answer:
Because the Qur'an is divided into three categories: either news about the prophets and their nations and those who came before, or commands and prohibitions and legislation for people, or tawhid (the oneness of Allah), which is the sincerity of worship to Allah the Exalted. These are the categories of the Qur'an: commands and prohibitions, or news about the awliya (close friends of Allah) and their enemies and what happened to them and what will happen to them in the future, or legislation, whether a command or a prohibition. Thus are the categories of the Shari'ah. So Surat al-Fatihah took on the category of tawhid, which is one-third, as in the hadith that it is equivalent to one-third of the Qur'an. And Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him) has a book on this topic titled "The Answer of the People of Knowledge and Faith to the Claim that 'Say: He is Allah, the One' is equivalent to one-third of the Qur'an." It is printed and available, and it is also printed with his fatwas. Yes.