Bukhari

Hadith Commentary:
In Arabia, just as men underwent circumcision, women also underwent circumcision, and just as men performed circumcision for men, women performed circumcision for women.
This practice was prevalent even in the pre-Islamic era (Jahiliyyah), and Islam maintained it because it was among the remaining practices of Ibrahim (alayhis salam) that persisted among the Arabs.
Since the mother of Siba‘ ibn ‘Abd al-‘Uzza used to perform circumcision for women, Hamzah (radi Allahu anhu) reproached him for the disgrace of his mother’s profession.
Wahshi became Muslim, and after embracing Islam, all his previous sins were forgiven.
However, he had killed the noble uncle of the Prophet (sallallahu alayhi wa sallam), Hamzah (radi Allahu anhu), in such a merciless manner that when he was martyred, his chest was ripped open, his heart was taken out, and his body was mutilated.
Therefore, it was only natural that seeing him would remind the Prophet (sallallahu alayhi wa sallam) of the sorrowful martyrdom of Hamzah (radi Allahu anhu).
For this reason, the Prophet (sallallahu alayhi wa sallam) told him to stay away from him.
The Prophet (sallallahu alayhi wa sallam) declared Hamzah (radi Allahu anhu) as the leader of the martyrs (Sayyid al-Shuhada’).
Hafiz Sahib says:
He said: The Messenger of Allah (sallallahu alayhi wa sallam) went out searching for Hamzah and found him in the valley, mutilated. He said: “If it were not that Safiyyah”—meaning the daughter of ‘Abd al-Muttalib—“would be grieved, and if it were not that this would become a practice after me, I would have left him until he would be resurrected from the bellies of wild beasts and the crops of birds.” Ibn Hisham added: He said, “No one has ever been afflicted as you have.” Then Jibril descended and said: “Indeed, Hamzah is written in the heavens as the Lion of Allah and the Lion of His Messenger.”
Al-Bazzar and al-Tabarani narrated with a chain containing some weakness from Abu Hurayrah that when the Prophet (sallallahu alayhi wa sallam) saw Hamzah had been mutilated, he said: “May Allah’s mercy be upon you. Indeed, you were one who maintained the ties of kinship and did much good. If it were not for the grief of those after you, it would have pleased me to leave you until you would be resurrected from various bellies.” Then he swore, while standing there, “I will surely mutilate seventy of them in retaliation.” Then the Qur’an was revealed: “And if you punish, then punish with the like of that with which you were afflicted…” () (Fath al-Bari).
That is, on the occasion of Uhud, the Messenger of Allah (sallallahu alayhi wa sallam) went out searching for the body of Amir Hamzah (radi Allahu anhu) and found it in a valley, mutilated.
Seeing him grieved the Prophet (sallallahu alayhi wa sallam) so much that he said: “If it were not for the thought of how much pain Safiyyah bint ‘Abd al-Muttalib would feel upon seeing her brother’s body in this state, and if it were not for the concern that people after me would take this as a practice for every martyr, I would have left this body as it is.
Wild beasts and birds would have eaten it, and on the Day of Resurrection, he would have been resurrected from their bellies and brought to the plain of gathering.”
Ibn Hisham added that the Prophet (sallallahu alayhi wa sallam) said: “O Hamzah! No one has ever been treated as you have been by these disbelievers.”
At that moment, Jibril (alayhis salam) descended and said: “The name of Amir Hamzah (radi Allahu anhu) has been written in the heavens as the Lion of Allah and the Lion of His Messenger.”
And in al-Bazzar and al-Tabarani, it is narrated that when the Prophet (sallallahu alayhi wa sallam) saw the body of Amir Hamzah (radi Allahu anhu), he said: “O Hamzah! May Allah have mercy on you.
You were very devoted to maintaining kinship ties and did much good, and if it were not for the fear that this grief would remain after you, it would have pleased me to leave your body as it is, and various animals would have eaten you, and you would have been resurrected from their bellies and brought to the plain of gathering.”
Then, right there, the Prophet (sallallahu alayhi wa sallam) swore that he would do the same to seventy of the disbelievers.
At that moment, this verse of the Noble Qur’an was revealed: “And if you punish [the enemy], then punish with the like of that with which you were afflicted; but if you are patient and do not retaliate, then patience is better for those who are patient.” ()
Upon the revelation of this verse, the Messenger of Allah (sallallahu alayhi wa sallam) said: “O Allah! Now I will not take any revenge at all; rather, I will be patient.”
Sallallahu alayhi wa sallam.

Hadith Commentary:
➊
Wahshi killed Hazrat Hamza (radi Allahu anhu) with such brutality that he cut open his chest, removed his heart from inside, and mutilated his body.
➋
It was only natural that seeing Wahshi would remind the Messenger of Allah (sallallahu alayhi wa sallam) of the painful martyrdom of Hazrat Hamza (radi Allahu anhu), and for this reason, he instructed Wahshi to stay away from him. In fact, he said to him:
“O Wahshi! Go and strive in the path of Allah just as you used to prevent people from the path of Allah before.”
After this, Wahshi did not come before the Messenger of Allah (sallallahu alayhi wa sallam) until his passing.
➌
Hafiz Ibn Hajar (rahimahullah) writes:
On the occasion of Uhud, the Messenger of Allah (sallallahu alayhi wa sallam) went out to search for the body of Hazrat Hamza (radi Allahu anhu), and found him in a low-lying area. His appearance had been disfigured. Seeing him, the Prophet (sallallahu alayhi wa sallam) was greatly grieved. He said:
“If I did not fear that Safiyyah bint Abdul Muttalib would be overcome with grief upon seeing her brother’s body, and that after me people would take mutilating the body of a martyr as a Sunnah, I would have left him in this state, so that beasts and birds would eat him, and then on the Day of Resurrection he would be brought forth from their bellies and presented in the field of gathering.”
(Musnad Abi Ya’la (Husayn Salim) Hadith 3568 and Fath al-Bari: 7/464)
➍
Although previous sins are forgiven upon accepting Islam, Wahshi still had the fear of Allah in his heart. He thought that just as he had martyred a great and noble man during the time of disbelief, he should now, in the time of Islam, kill some wicked and most evil person to make amends. Thus, during the caliphate of Hazrat Abu Bakr as-Siddiq (radi Allahu anhu), he killed Musaylimah the Liar, the details of which will come in the Book of Tribulations (Kitab al-Fitan).
➎
From this hadith, we also learn of Hazrat Wahshi’s (radi Allahu anhu) intelligence and skill in physiognomy (recognition by features). In one narration, it is detailed that Wahshi said to Ubaydullah:
“Since I handed you over to your nursing mother, who breastfed you, I have not seen you until today. And even then, I gave you to her while she was riding her camel at the place of Dhi Tuwa. I lifted you up and handed you over to her. At that time, I saw your foot. Now, when you came and stood before me, I recognized that foot.”
From this, it is evident that Hazrat Wahshi (radi Allahu anhu) compared Ubaydullah’s feet to those of the child he had lifted fifty years earlier.
(Fath al-Bari: 7/461)