They make limited use of the world to earn a living. They purchase necessary goods and services made available in the world.
وَهُمْ يَسْتَعْمِلُونَ ٱلْعَالَمَ ٱسْتِعْمَالًا مَحْدُودًا لِتَأْمِينِ لُقْمَةِ ٱلْعَيْشِ .‏