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."
Sahih al-Bukhari Book 34, Hadith 3
← Previous Hadith `Abdur Rahman bin `Auf said, "When we came to Medina as emigrants, Allah's Messenger (ﷺ) established a bond of brotherhood between me and Sa`d bin Ar-Rabi`. Sa`d bin Ar-Rabi` said (to me), 'I am the richest among the Ansar, so I will give you half of my wealth and you may look at my two wives and whichever of the two you may choose I will divorce her, and when she has completed the prescribed period (before marriage) you may marry her.' `Abdur-Rahman replied, "I am not in need of all that. Is there any marketplace where trade is practiced?' He replied, "The market of Qainuqa." `Abdur- Rahman went to that market the following day and brought some dried buttermilk (yogurt) and butter, and then he continued going there regularly. Few days later, `Abdur-Rahman came having traces of yellow (scent) on his body. Allah's Messenger (ﷺ) asked him whether he had got married. He replied in the affirmative. The Prophet (ﷺ) said, 'Whom have you married?' He replied, 'A woman from the Ansar.' Then the Prophet (ﷺ) asked, 'How much did you pay her?' He replied, '(I gave her) a gold piece equal in weigh to a date stone (or a date stone of gold)! The Prophet (ﷺ) said, 'Give a Walima (wedding banquet) even if with one sheep .' "

Sahih al-Bukhari Book 34, Hadith 2 Next Hadith → `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.

Sahih al-Bukhari Book 34, Hadith 4