Bukhari

Hadith Commentary:

That is, the obligatory charity (sadaqah) is also fulfilled by acting justly among people. In other words, showing gratitude for Allah’s blessings is also achieved by establishing justice among people—this too is a form of charity (sadaqah), the effects of which are far-reaching. For this reason, reconciling between people has been described as a deed even more important than voluntary prayer (nafl salah) and voluntary fasting (nafl sawm).

Hadith Commentary:
(1)
A person's bones and joints constitute his essential being. It is through them that he moves. Therefore, bones and joints are among Allah's great favors, and gratitude to Allah is obligatory for every favor.
(2)
Allah, the Exalted, has granted concession that by reconciling between people and establishing justice among them, the expiation (kaffarah) is fulfilled. The relevance to the chapter heading is that the objective of judgment is to establish justice and to end disputes; furthermore, not everyone is a ruler. Rulers are commanded to act with justice and fairness, and those who are not rulers should fulfill the duty of reconciliation among people. And Allah knows best.

Hadith Commentary:
The hadith is general, but here, travelers on the journey of jihad are specifically intended; this is why the Imam rahimahullah has included it in the Book of Jihad.
If any brother becomes fatigued or is overburdened during this blessed journey, then assisting him holds a very high status.
In general, helping any traveler is a great virtuous deed, regardless of who the traveler may be.
Similarly, uttering such words from the tongue that bring happiness to the listener, and those words are related to goodness, then such words are also recorded as charity.
In the Noble Qur’an, such words have been declared far better than that charity which, due to it, the recipient is hurt upon hearing something; therefore, it is obligatory upon every Muslim believer that he should either utter words of goodness or remain silent.
Every step taken towards prayer is also charity, and guiding a lost traveler to the correct path is also a very great charity.
This is the pure moral teaching of Islam, which has granted its true followers universal acceptance in the heavens and the earth.
Allahumma aj‘alna minhum (Ameen).

Hadith Commentary:
➊
Although this hadith does not specifically mention travel, the wording is absolute, which by default includes the state of travel, and travelers on the journey of jihad are especially intended here. If any brother is facing difficulty or is overburdened during this sacred journey, then helping him in such circumstances is a tremendously great deed. In general, assisting any traveler is a great act of goodness, but in the journey of jihad, this virtue is multiplied manifold.

➋
When helping someone mount their ride by giving them support is a cause of virtue, then allowing a tired and exhausted person to ride on one’s own mount is even more greatly rewarded and meritorious.
(Fath al-Bari: 6/104)

Hadith Commentary:
Since in this hadith, among the mentioned forms of charity, it is also stated that helping someone in matters of riding (transportation) in any possible way is included, therefore this narration has been brought under this chapter.

This hadith also proves that it is obligatory for every Muslim to perform some good deed every day as gratitude for the well-being of each of his joints.

By the word "salāmi," every joint of a person and the tips of the fingers are meant.

Some have said that every hollow bone is called "salāmi." The same word is used for both singular and plural.

Some have considered it to be the plural of the word "salāmiyah."

Hadith Commentary:
➊
Imam Bukhari rahimahullah has alluded to a hadith under the mentioned chapter heading, which Imam Muslim rahimahullah has narrated: Hazrat Abbas radi Allahu anhu says, "On the occasion of the Battle of Hunayn, I was holding the stirrup of the mount of the Messenger of Allah sallallahu alayhi wa sallam."
(Sahih Muslim, al-Jihad, Hadith 4612 (1775))
Also, "helping the rider" is general—whether one mounts him or assists him in riding.
(Fath al-Bari: 6/161)

➋
One form of this cooperation is also to help someone by carrying his luggage, as Imam Bukhari rahimahullah has established a chapter on this hadith:
(BAB: The Virtue of One Who Carries His Companion’s Luggage During Travel)
i.e., "The virtue of carrying a companion’s luggage during travel."
(Sahih Muslim, al-Jihad, Hadith: 72)
The meaning is that every kind of assistance to a person regarding his mount will be counted as charity (sadaqah).
It is also established that a person should, in gratitude for the soundness of every joint, continue to perform some good deed.
And Allah knows best.

Hadith Commentary: Benefits and Issues: Allah, the Exalted, has created three hundred and sixty (360) joints in every human body, and gratitude for them is that a person should use these limbs for the very purpose for which they were created, and should perform righteous and good deeds for the health and well-being of these limbs, and remain engaged in the remembrance and mention of Allah, the Exalted.

He should deal kindly with the creation and, as much as possible, cooperate with them. In this way, gratitude for the blessing of the joints will also be fulfilled, and reward and recompense will also be attained.

If a person is not able to do anything at all, then if he cannot benefit others, at least he should not harm himself by doing evil to them; at the very least, he should refrain from causing harm to others, so that he may be saved from crime and sin, and this will be a charity (sadaqah) for himself.