Bukhari

Hadith Commentary:
1.
According to one narration, this Bedouin asked the Messenger of Allah (sallallahu alayhi wa sallam) three times, "Who will protect you from me?" The Messenger of Allah (sallallahu alayhi wa sallam) replied each time, "Allah will protect me."
(Sahih al-Bukhari, Kitab al-Jihad wa'l-Siyar, Hadith: 2910)
This means that Allah, the Exalted, granted His Messenger (sallallahu alayhi wa sallam) special protection; otherwise, why would the Bedouin need to ask repeatedly when the Messenger of Allah (sallallahu alayhi wa sallam) was sitting before him unarmed?
But when the Bedouin realized that killing him was not within his power, he surrendered himself to the Prophet (sallallahu alayhi wa sallam).
(Fath al-Bari: 7/534)
2.
This incident occurred around the time of the Battle of Banu Mustaliq; for this reason, it has been mentioned here, otherwise, in essence, it has no direct connection to the Battle of Banu Mustaliq.
And Allah knows best.

Hadith Commentary:
This hadith has already been mentioned above. Here, Imam Bukhari rahimahullah has brought this hadith to establish that if military personnel, while traveling during the day, wish to take a midday rest (qaylulah) in the wilderness, they may search for a shady tree according to their preference and may separate from their leader to rest. This is not contrary to the etiquettes of warfare.

Hadith Commentary:
1.
It is understood from this hadith that at that time, arrangements for your (the Prophet's sallallahu alayhi wa sallam) protection were not made.
After this incident, when you took measures for your protection, the verse was revealed:
﴿وَاللَّـهُ يَعْصِمُكَ مِنَ النَّاسِ﴾ "Allah will protect you from the people." (Al-Ma'idah: 5/67)
After this, you discontinued the protective measures and relied solely on divine protection.
2.
Imam Bukhari rahimahullah's purpose is to show that if military personnel, while traveling somewhere at noon, wish to take a midday nap (qaylulah) in the wilderness, they may search for a shady tree according to their preference and may separate from their leader for rest, and this is not contrary to the etiquettes of war.

Hadith Commentary:

Ibn Ishaq narrated in al-Maghazi that the disbelievers said to that Bedouin, whose name was Du’thoor, “At this moment, Muhammad (sallallahu alayhi wa sallam) is alone and it is a good opportunity.” So he took your (sallallahu alayhi wa sallam) sword and stood by your head and said, “Now who will save you?” You (sallallahu alayhi wa sallam) replied, “My savior is Allah.” As soon as you (sallallahu alayhi wa sallam) said this, Jibril (alayhis salam) immediately arrived and struck that Bedouin on his chest, causing the sword to fall from his hand. You (sallallahu alayhi wa sallam) then picked it up and said, “Now who will save you?” He replied, “No one.”

Hadith Commentary:
➊
According to a narration in Sahih al-Bukhari, the name of the person who drew a sword against the Messenger of Allah (sallallahu alayhi wa sallam) was Ghawrath ibn al-Harith.
(Sahih al-Bukhari, al-Maghazi, Hadith: 4136)

➋
In the narration of Imam Bayhaqi (rahimahullah), it is mentioned that upon hearing the reply of the Messenger of Allah (sallallahu alayhi wa sallam), the sword fell from the hand of that Bedouin. The Messenger of Allah (sallallahu alayhi wa sallam) picked it up and said:
“Now who will save you from me?”
He replied:
“I hope for good treatment from you.”
The Prophet (sallallahu alayhi wa sallam) said:
“Will you accept Islam?”
He said:
“I will not accept Islam, but I promise you that I will not fight against you, nor will I support those who fight against you.”
So the Prophet (sallallahu alayhi wa sallam) let him go.
After that, he went to his people and said:
“I have come from the best of mankind.”
(Dala’il al-Nubuwwah lil-Bayhaqi: 3/456)

➌
The purpose of this hadith is that Muslims should not be heedless regarding their weapons; however, if the circumstances are not so severe, a mujahid may keep his weaponry nearby and rest himself.
And Allah knows best.