Sahih al-Bukhari Book 34, Hadith 5
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."
`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.
`Uqba bin Al-Harith said that a black woman came and claimed that she had suckled both of them (i.e. `Uqba and his wife). So, he mentioned that to the Prophet (ﷺ) who turned his face from him and smiled and said, "How (can you keep your wife), and it was said (that both of you were suckled by the same woman)?" His wife was the daughter of Abu Ihab-al-Tamimi.