Heart, Self & Soul: The Sufi Psychology of Growth, Balance, and Harmony, Robert Frager, Quest Books, Theosophical Publishing House, p.  154

Service (or adab)

Robert Frager

To serve others with gratitude for the opportunity of service is good  adab. A dervish seeks opportunities to serve, knowing that service is an essential part of the spiritual path.

Some years ago, an American dervish was visiting Turkey, and he spent all his free time in Sheikh Muzaffer's bookstore. When a boy came to the shop with tea for everyone, the American dervish immediately pulled out his wallet and paid it. At lunch time, he rushed to pay for the lunches brought to the store. As he reached for his wallet a third time to pay for soft drinks, Sheikh Muzaffer scolded him, "Do you want to take all the benifits of serving others today? Don't be selfish; give someone else a chance to pay!" Serving others is like serving God.