Sahih Bukhari

Narrated Khabbab:I was a blacksmith in the Pre-Islamic period, and 'Asi bin Wail owed me some money, so I went to him to demand it. He said (to me), ""I will not pay you unless you disbelieve Muhammad."" I said, ""I will not disbelieve till Allah kills you and then you get resurrected."" He said, ""Leave me till I die and get resurrected, then I will be given wealth and children and I will pay you your debt."" On that occasion it was revealed to the Prophet: 'Have you seen him who disbelieved in Our signs and says: Surely I will be given wealth and children? Has he known the unseen, or has he taken a covenant from the Beneficent (Allah)?