Sahih al-Bukhari Book 34, Hadith 4
`Ukaz, Majanna and Dhul-Majaz were marketplaces in the Pre-Islamic period of ignorance. When
Islam came, Muslims felt that marketing there might be a sin. So, the Divine Inspiration came: "There
is no harm for you to seek the bounty of your Lord (in the seasons of Hajj)." (2.198) Ibn `Abbas
recited the Verse in this way.
When `Abdur-Rahman bin `Auf came to Medina, the Prophet (ﷺ) established a bond of brotherhood between him and Sa`d bin Ar-Rabi al-Ansari. Sa`d was a rich man, so he said to `Abdur-Rahman, "I will give you half of my property and will help you marry." `Abdur-Rahman said (to him), "May Allah bless you in your family and property. Show me the market." So `Abdur-Rahman did not return from the market) till he gained some dried buttermilk (yogurt) and butter (through trading). He brought that to his house-hold. We stayed for sometime (or as long as Allah wished), and then `Abdur-Rahman came, scented with yellowish perfume. The Prophet (ﷺ) said (to him) "What is this?" He replied, "I got married to an Ansari woman." The Prophet (ﷺ) asked, "What did you pay her?" He replied, "A gold stone or gold equal to the weight of a date stone." The Prophet (ﷺ) said (to him), "Give a wedding banquet even if with one sheep."
The Prophet (ﷺ) said "Both legal and illegal things are obvious, and in between them are (suspicious) doubtful matters. So whoever forsakes those doubtful things lest he may commit a sin, will definitely avoid what is clearly illegal; and whoever indulges in these (suspicious) doubtful things bravely, is likely to commit what is clearly illegal. Sins are Allah's Hima (i.e. private pasture) and whoever pastures (his sheep) near it, is likely to get in it at any moment."