The Meaning of Inclusion and Necessity in the Oneness of Worship and the Oneness of Lordship

Question:
May Allah reward you. Honorable Shaykh, a questioner asks: What is the meaning of their statement that the oneness of worship (tawhid al-uluhiyyah) includes the oneness of lordship (tawhid al-rububiyyah), and that the oneness of lordship necessitates the oneness of worship?

Answer:
It is clear. The oneness of worship includes the oneness of lordship, meaning it is contained within it. "Inclusion" means being inside. So, the oneness of lordship is inside the oneness of worship. As for the oneness of worship, the oneness of lordship is a necessary consequence, meaning it is required that if one affirms Allah’s oneness in His lordship, one must affirm His oneness in His worship. This is because the polytheists affirmed Allah’s oneness in His lordship, but they did not affirm His oneness in His worship. And this necessitates that if they acknowledge that He is the Lord, they are required to single Him out in worship. Yes.
And "inclusion" is when a thing is inside another thing. As for "necessity," it is when a thing is outside the thing, but it is not required for it, and it is external to it. For example, the house.
The house you enter is inclusive of the roof and the walls, which are inside it. But the external facilities, which are the water pipes and the courtyard, these are necessities for the house. They are not inside it; they are external to it, but they are indispensable for it; they are necessary for it.