The inclusion of the three types of tawhid (the oneness of Allah) in the word of tawhid

Question:
May Allah reward you. His second point in this letter, and in his question he says: How was the word of tawhid, "La ilaha illa Allah," encompassing of all types of tawhid?

Answer:
Yes, "La ilaha illa Allah." This is a negation of all that is worshipped other than Allah, except Allah. This is an affirmation of worship for Allah (Mighty and Majestic). So this word, in its brevity, encompasses a negation and an affirmation: the negation of worship for other than Allah, because its meaning is that there is no deity worthy of worship except Allah (Glorified and Exalted is He), and the affirmation of it for Allah (Blessed and Exalted is He). In it are the types of tawhid: in it is tawhid al-rububiyyah (oneness of lordship), in it is tawhid al-uluhiyyah (oneness of worship), and in it is tawhid al-asma' wa al-sifat (oneness of the names and attributes); because they are interrelated, as the types of tawhid are interrelated with one another. Yes.