What is the explanation of what is reported from the Prophet (peace and blessings be upon him) that he prayed nine rak'ahs in the night prayer, not sitting except in the eighth and ninth?

The questioner : Shaykh, here in the hadiths that came in "Sahih Muslim" regarding the night prayer of the Prophet (peace and blessings be upon him), when it is reported that he used to pray nine, not sitting except in the eighth and ninth, now, what is the original principle here? Does this mean a specific text for a specific prayer?

The Shaykh : No, this is to clarify permissibility, to clarify permissibility.
The student : It is not for superiority, it is to clarify permissibility. It is not to clarify superiority, it is to clarify permissibility. So the superiority remains with us as two by two.
Another student: . Eight, he prays four, dragging them in one drag, and he testifies in the middle, then _ this is the second form he mentionedThe Shaykh : _ and he prays the second four and testifies the final testimony, and the third form is that he drags the eight with one testimony. Is that not so?
Another student: We said three forms, a first form: at the head of every two rak'ahs, a second form: four and he testifies in the two.
Another student: They are eight.
Another student: His question is about the eight rak'ahs.
Another student: About eight, O Abu 'Abd Allah.
Another student: About the eight rak'ahs.
Another student: Yes, indeed.
Another student: It should be in its meaning in the eight, it should be four.
Another student: Four testimonies?
Another student: This second form will have four testimonies.

The Shaykh : ...
The student : If they were connected, my Shaykh.
Another student: Regarding the connection, Shaykh.
The student : The eight are connected, it should also mean that if he likes to sit, which is the second in superiority in your ordering, that in the eight, every two he sits.

The Shaykh : The jurisprudential rule: whatever worship is increased in worship, it is better, so two salams are better than one, two testimonies are better than one, three are better than two, and so on.
The student : Meaning, in the eight rak'ahs, if they are connected and he sits at the head of every two, it is better, with the ordering that he orderedThe Shaykh .
Another student: Ah, he testifies and says.
The student : Ah, he testifies and stands, he testifies and stands, with the permissibility of the third stage, which is at the head of the nine or the head of the eight or the head of the seven, like the night prayer that Abu Hammam asked about.