Bukhari

Hadith Commentary:
The name of this Qahtani individual is mentioned as Jahjah in the narration of Sahih Muslim.
It is said that this Qahtani will emerge after Imam Mahdi and will follow directly in his footsteps, as narrated by Abu Nu‘aym in "Al-Fitan."
(Wahidi)
In some manuscripts, this chapter and several subsequent chapters are mentioned after the story of Zamzam.

Hadith Commentary:
➊
The lineage of the tribes of Yemen, such as Himyar, Kindah, and Hamdan, etc., traces back to Qahtan.
There is a difference of opinion as to whether Qahtan is from the descendants of Prophet Isma'il (alayhis salam) or not.
In any case, near the end of times, there will be a king from Qahtan who will drive people with his staff.
This means that he will make people his subjects, just as a shepherd subjugates his goats.
There is a narration in Sahih Muslim:
"The world will not end until a man will become the master of the world, who will be called Jahjah."
(Sahih Muslim, Al-Fitan, Hadith: 7309(2911))
It is possible that the name of the Qahtani will be Jahjah.

➋
This person will come after Imam Mahdi (rahimahullah) and will rule by following in his footsteps.
Some narrations indicate that he will rule for twenty years.
This hadith is a prophecy of the Messenger of Allah (sallallahu alayhi wa sallam) whose occurrence has not yet taken place.
And Allah knows best.
(Fath al-Bari: 6/667)

Chapter of Sahih al-Bukhari Hadith Number: 7117: «بَابُ تَغْيِيرِ الزَّمَانِ حَتَّى يَعْبُدُوا الأَوْثَانَ:»
Relevance between the Chapter and the Hadith:
Imam al-Bukhari rahimahullah, in the chapter heading, has alluded to the changing of times and the beginning of idol worship in Arabia, whereas in the hadith under the chapter, which he narrates from Sayyiduna Abu Hurayrah radi Allahu anhu, there are no such words from which the aspect of conformity becomes apparent.

Accordingly, al-Isma‘ili has raised this objection:
«ليس هذا الحديث من ترجمة الباب فى شيئي.» [شرح ابن بطال 60/10]
“This hadith has nothing to do with the chapter heading.” In response to this objection, ‘Allamah Mahlib rahimahullah has provided an answer, as he rahimahullah says:
«بأن وجهه أن القحطاني إذا قام وليس من بيت النبوة ولا من قريش الذين جعل الله فيهم الخلافة فهو من أكبر تغير الزمان وتبديل الأحكام بأن يطاع فى الدين من ليس أهلاً لذالك.» [فتح الباري لابن حجر : 67/4]
“That is, when the Qahtani appears, who will neither be from the House of Prophethood nor from the Quraysh, among whom Allah the Exalted established the Caliphate, then this will be among the great changes of the times and the alteration of rulings, that in the religion, a person has become obeyed who was not worthy of it.”
The summary of ‘Allamah Mahlib rahimahullah’s statement is that when the Qahtani man appears and drives people with his staff, that era will have been severely afflicted by changes; this is precisely what Imam al-Bukhari rahimahullah wants to establish through the mentioned hadith, from which the relevance to the chapter becomes clear.

‘Allamah ‘Ayni rahimahullah has also given a similar explanation of the relevance, saying:
«مطابقة للترجمة من حيث إن سوق رجل من قحطان الناس بعصاه إنما يكون فى تغيير الزمان و تبديل أحوال الإسلام.» [عمدة القاري للعيني : 306/24]
“The conformity of the hadith to the chapter heading is that when the Qahtani person will drive people with his staff, that will be a time of changes, and the conditions of Islam will also be altered.”

Hafiz Ibn Hajar al-‘Asqalani rahimahullah, commenting in Fath al-Bari, writes:
«وحاصله أنه مطابق لصدر الترجمة وهو تغير الزمان و تغيره أعم من أن يكون فيما يرجع إلى الفسق أو الكفر.» [فتح الباري لابن حجر : 67/24]
“The upshot is that the connection between the chapter and the hadith is that the change of times, and its alteration, is more general than whether its reference is to immorality or disbelief.”
Therefore, the era in which the Qahtani will drive people with his stick will be one severely afflicted by changes, because in that period the conditions of Islam will have changed and the majority will be engaged in idol worship; thus, from here, the relevance between the chapter and the hadith is established.

Hadith Commentary:
The name of Abu Hurairah radi Allahu anhu is Abdur Rahman bin Sakhr.
He embraced Islam during the Battle of Khaybar and joined the Ashab al-Suffah, remaining constantly in the company of the Prophet sallallahu alayhi wa sallam.
He passed away at the age of 78 in the year 58 AH.
He had kept a small cat, due to which he became well-known as Abu Hurairah radi Allahu anhu wa ardah.
Near the Day of Judgment, there will be a certain king from the tribe of Qahtan.

Hadith Commentary:
Two outcomes will result from the changing of times:
➊ One is that a person, becoming hopeless due to circumstances, will reach the point of disbelief (kufr), as has been mentioned in the previous hadith.
➋ The second is that a person will reach the point of immorality and wickedness (fisq wa fujur), as is mentioned in this hadith: that a leader from (the tribe of) Qahtan will drive people with his stick.

At that time, the condition of Islam will change, because this person will not be from among the caliphs (khulafa), nor will he be adorned with the honor of the caliphate (khilafah). Rather, he will be a rustic and uncivilized person who will drive people like animals, or, in his view, horses and donkeys will be of the same standard—that is, he will drive all people with the same stick.

An era of lawlessness will prevail, and people will live their lives free from every kind of regulation.

And Allah knows best.

Hadith Commentary: Benefits and Issues: According to Imam Qurtubi, this Qahtani is the person named Jahjah who will be mentioned in the next hadith. He will keep his subjects under control like a flock of goats. He has not yet appeared.