Bukhari

Hadith Commentary:
From here, the chapter heading is derived: that the Prophet (sallallahu alayhi wa sallam) kept them hungry for one day as a form of punishment, then kept them hungry the next day as well. Coincidentally, the new moon was sighted; otherwise, more fasts would have been observed to see how long these people could endure.
From this, the accusation of disobeying the command is established against the Companions (radi Allahu anhum).
The answer to this is that the Prophet’s (sallallahu alayhi wa sallam) instruction was not as a binding command; otherwise, the Companions would never have acted contrary to it. Rather, it was out of compassion and kindness towards them.
When they did not prefer this ease, he said, “Very well, let it be as you wish. Now let us see how many days you can perform wisal (continuous fasting without breaking the fast at sunset).”
From this hadith, it is derived that the Imam or ruler may punish a criminal with ta’zir (discretionary punishment) by word, action, or in whatever manner he deems appropriate.
Similarly, by causing financial loss, i.e., by imposing a fine, etc.
Our Imam, Ibn Qayyim (rahimahullah), has mentioned many evidences for this in his book al-Qada, that ta’zir by financial means is valid in our Shari’ah, though some people have denied this, which is their mistake.
Sa’id ibn al-Musayyib (rahimahullah) was a Qurashi, from the Makhzumi clan, and a resident of Madinah.
He was born during the caliphate of Umar (radi Allahu anhu), and was a unique figure in jurisprudence (fiqh), hadith, asceticism (zuhd), and worship.
Makhul said, “I traveled to many cities, but I never found a greater scholar than Sa’id. He performed Hajj forty times in his lifetime.”
He passed away in the year 93 AH.
Rahimahullah.

Hadith Commentary:
The meaning of wisal is:
To join two fasts in such a way that nothing is eaten or drunk between them.
The Messenger of Allah (sallallahu alayhi wa sallam) behaved with the people in the aforementioned manner as a form of admonition.
From this, it is understood that admonition can also be given by withholding food.
The Messenger of Allah (sallallahu alayhi wa sallam) used to admonish in various ways, as he said to Abu Dharr (radi Allahu anhu):
"Indeed, you are a man in whom there still remains a trait of ignorance (jahiliyyah)."
(Sahih al-Bukhari, al-Iman, Hadith: 30)
Regarding the one who announces a lost item in the mosque, he said:
"May Allah not return it to you."
(Sahih Muslim, al-Masajid, Hadith: 1260(568))
Concerning the one who engages in trade in the mosque, the command is that it should be said to him:
"May Allah not make your trade profitable."
(Jami‘ at-Tirmidhi, al-Buyu‘, Hadith: 1321)
However, for admonition, taunting, reviling, and obscene speech are not permissible.