that his father said, "The Prophet (ﷺ) forbade the selling of gold for gold and silver for silver except if they are equivalent in weight, and allowed us to sell gold for silver and vice versa as we wished."
Sahih al-Bukhari Book 34, Hadith 130
← Previous Hadith I asked Al-Bara' bin `Azib and Zaid bin Arqam about money exchanges. Each of them said, "This is better than I," and both of them said, "Allah's Messenger (ﷺ) forbade the selling of silver for gold on credit. "

Sahih al-Bukhari Book 34, Hadith 129 Next Hadith → Allah's Messenger (ﷺ) said, "Do not sell fruits of dates until they become free from all the dangers of being spoilt or blighted; and do not sell fresh dates for dry dates." Narrated Salim and `Abdullah from Zaid bin Habit' "Later on Allah's Messenger (ﷺ) permitted the selling of ripe fruits on trees for fresh dates or dried dates in Bai'-al-'Araya, and did not allow it for any other kind of sale."

Sahih al-Bukhari Book 34, Hadith 131