He means by saying that He warns you in spending of poverty. And He says to you that the consequence of your spending is that you will become poor. And it has been recited: poverty, with a dammah. And poverty, with two fathahs. And the promise is used for good and evil. Allah, the Most High, said: (The Fire, which Allah has promised for those who disbelieve). And He commands you with immorality and incites you to be stingy and to withhold charity, like the incitement of the one who commands to the one who is commanded. And the immoral among the Arabs is the stingy one. Allah, the Most High, promises you in spending forgiveness for your sins and atonement for them, and a favor, and that He will replace for you better than what you have spent, or a reward for it in the Hereafter.