Umar bin Hafs bin Ghyath عمر بن حفص بن غياث · The Book on Business

"Ibn 'Umar and I went to Abu Sa'eed and he narrated to us: 'the Messenger of Allah (ﷺ) said - and I heard him with these ears: "Do not sell gold for gold except kind for kind, nor sliver for silver except kind for kind, do not exchange more of one than the other, and do not sell what is not present from them for what is present." There are narrations on this topic from Abu Bakr, 'Umar, 'Uthman, Abu…

"The Prophet (ﷺ) prohibited studding the stallion." There are narrations on this topic from Abu Hurairah, Anas, and Abu Sa'eed. The Hadith is Ibn 'Umar is a Hasan Sahih Hadith. This is acted upon according to some of the people of knowledge. There are those who made concession for accepting an honorarium for that.