﴿ لِلْفُقَرَآءِ ٱلَّذِينَ أُحْصِرُوا۟ فِى سَبِيلِ ٱللَّهِ لَا يَسْتَطِيعُونَ ضَرْبًۭا فِى ٱلْأَرْضِ يَحْسَبُهُمُ ٱلْجَاهِلُ أَغْنِيَآءَ مِنَ ٱلتَّعَفُّفِ تَعْرِفُهُم بِسِيمَٰهُمْ لَا يَسْـَٔلُونَ ٱلنَّاسَ إِلْحَافًۭا ۗ وَمَا تُنفِقُوا۟ مِنْ خَيْرٍۢ فَإِنَّ ٱللَّهَ بِهِۦ عَلِيمٌ ﴾

“[And give] unto [such of] the needy who, being wholly wrapped up in God's cause, are unable to go about the earth [in search of livelihood]. He who is unaware [of their condition] might think that they are wealthy, because they abstain [from begging]; [but] thou canst recognize them by their special mark: they do not beg of men with importunity. And whatever good you may spend [on them], verily, God knows it all.”

There are two ways of spending one’s earnings in this world. One is to spend in ways shown by Satan. Another is to spend in ways shown by God. What Satan does is to impress on the minds of human beings the importance of personal requirements, and bring about conviction that all their earnings are best spent on personal comforts and luxuries.