Bukhari

Hadith Commentary:
From this, those people have derived evidence who do not consider continuous fasting (sawm al-wisal) to be prohibited, but rather say that the Messenger of Allah (sallallahu alayhi wa sallam) forbade it out of compassion for his ummah, just as he did not come out on the fourth night for night prayer (qiyam al-layl) out of fear that it might become obligatory. And Ibn Abi Shaybah has narrated with a sahih chain from Abdullah ibn al-Zubayr (radi Allahu anhu) that he used to fast continuously for fifteen days at a time.
And the Messenger of Allah (sallallahu alayhi wa sallam) himself observed continuous fasting along with his companions (radi Allahu anhum).
If it had been prohibited, he (sallallahu alayhi wa sallam) would never have allowed his companions (radi Allahu anhum) to observe it.
(Wahidi)

Hadith Commentary:
(1)
Regarding the fasting of wisal (continuous fasting without breaking at sunset), the majority of hadith scholars have adopted the position that observing consecutive fasts was a special characteristic (khasais) of the Messenger of Allah (sallallahu alayhi wa sallam), because he said:
“I am not like you in this matter.”
(2)
From this, it is understood that wisal is prohibited (haram) for the distinguished members of the ummah, except that there is a concession for wisal until the morning, as is explicitly mentioned in the hadith.
Aishah (radi Allahu anha) narrates:
The Messenger of Allah (sallallahu alayhi wa sallam) used to prohibit praying after Asr, but he himself would pray; similarly, he would prohibit continuous fasting, but he himself would observe it.
(Sunan Abi Dawud, Kitab al-Salat, Hadith: 1280)
(3)
The noble Companions (radi Allahu anhum) of the Messenger of Allah (sallallahu alayhi wa sallam) were very refined and well-mannered.
Their statement that you observe the fast of wisal was not in the form of an objection, but rather their purpose was to ascertain the reason for this special characteristic. So the Messenger of Allah (sallallahu alayhi wa sallam) said:
“Allah, the Exalted, has granted me such spiritual strength that I do not feel hunger or thirst.”
Ibn Abi Hatim narrated from the wife of Bashir bin Khasasiyyah, who said:
I intended to observe continuous fasting for two days and two nights, but my husband forbade me from it and narrated this hadith that the Messenger of Allah (sallallahu alayhi wa sallam) forbade it and considered it the practice of the Christians. The Prophet (sallallahu alayhi wa sallam) said:
“Fast as Allah has commanded you.
Fast until the night comes, and when night falls, break your fast immediately.”
(Musnad Ahmad, and Tafsir Ibn Abi Hatim: 6/347)
(4)
Imam Bukhari (rahimahullah) stated at the end:
My teacher, Uthman bin Abi Shaybah, did not narrate these words that the Messenger of Allah (sallallahu alayhi wa sallam) forbade the fast of wisal out of compassion for the ummah, whereas it is evident from the narrations that he did narrate these words. This means that he had heard the aforementioned words from his teacher, but sometimes he would narrate them and sometimes he would mention the hadith without them.
(Fath al-Bari: 4/260)

Hadith Commentary: Benefits and Issues: Malik is the father of Abdullah, and Buhaina is their mother.