Bukhari

Hadith Commentary:
In the era of ignorance (Jahiliyyah), four marketplaces were famous: ‘Ukaz, Dhu’l-Majaz, Majinnah, and Habashah. After the advent of Islam, buying, selling, and trade in these markets remained permissible only during the days of Hajj.
Allah Himself revealed in the Noble Qur’an the permissibility of this, declaring the profit gained through trade as His own bounty.
As is evident from the aforementioned verse ().
Engaging in trade was the best occupation of the predecessors (aslaf).
Through it, they reached the far corners of the world. However, it is regrettable that now Muslims have turned their attention away from it, the result of which is manifest in the form of poverty and humiliation.

Hadith Commentary:
(1)
In the era of Jahiliyyah, four marketplaces were very famous:
٭ Dhu’l-Majaz:
A market would be set up one mile from the plain of Arafah.
٭ Majinnah:
It was arranged near Marr az-Zahran in the lowlands of Makkah.
٭ ‘Ukaz:
This market was held at the Fataq location between Nakhlah and Ta’if.
٭ Habashah:
This market was set up in the land of Bariq towards Yemen from Makkah.
Since Dhu’l-Majaz and ‘Ukaz were held during the days of Hajj, they are mentioned in the hadith.
People used to dislike buying and selling during these days because these days are specified for the remembrance of Allah.
Allah, the Exalted, through the verse mentioned in the hadith, declared buying, selling, and trade permissible during these days.
(Fath al-Bari: 3/749–750)
(2)
The verse mentioned at the end of the hadith is a rare (shadh) recitation with the stated words, which is transmitted from Ibn ‘Abbas (radi Allahu anhu); however, in the mutawatir recitation, the words (fi mawasim al-hajj) are not present, and this is the preferred view.