Salmah bin Kahayl al-Hadrami سلمة بن كهيل بن حصين · The Book of Financial Transactions

"I saw people being beaten (in punishment) at the time of the Messenger of Allah for buying food unmeasured and selling it before bringing it to their own camp."

"We will sell her to you on condition that her loyalty (Walla) is to us," She mentioned that top the Messenger of Allah and he said: "That should not stop you. Loyalty belongs to the one who sets the slave free."

"The Prophet borrowed forty thousand from me, then some wealth came to him, and he paid me back and said: 'May Allah bless your family and your wealth for you: the reward for lending is praise and repayment."