al-Hasan al-Basri الحسن البصري · The Chapters on Business Transactions

"The Messenger of Allah (ﷺ) said: 'It is not permissible to sell something that is not with you, nor to profit from what you do not possess."'

"I heard the Messenger of Allah (ﷺ) say: 'Whoever sells defective goods without pointing it out, he will remain subject to the wrath of Allah, and the angels will continue to curse him.'"