Sulaiman bin Atyq سليمان بن عتيق · The Book of Financial Transactions

"Do not sell fruits until their condition is known. And he forbade (both) the seller and the purchaser (to engage in such a transaction).

"Go and buy a young camel for him." He came and said: "I could only get a Raba camel of good quality." He said: "Give it to him, for the best of the Muslims is the one who is best in repaying."