Yahya bin Hamza bin Waqd يحيى بن حمزة بن واقد · The Book of Financial Transactions

"The Messenger of Allah forbade Gharar transaction and Hasah transactions."

"The Messenger of Allah was asked about (buying) said; 'Will fresh dates decrees (in weight or volume) when they dry out? 'They said 'yes so he forbade that"

"The Messenger of Allah forbade selling a heap of dried dates whose volume is unknown for known volume of dried dates,"

"I was with the Prophet on a journey, and my camel got tired. I thought I wanted to let it go, but the Messenger of "Allah met me and prayed for it (the camel) and hit it. Then it started to run like never before. He said: 'Sell it to me for one Uwqyah.' I said" 'No.' He said: 'Sell it to me.' So I sold it to him for one Uwqiyah but stipulated an exception, to ride it until…