تحفة النظار في غرايب الامصار وعجايب الاسفار 10.1.6

10.1.6

When people became accustomed to this from him, the merchants in the lands of Sind and Hind began to lend thousands of dinars to everyone coming to the Sultan, and to equip him with whatever he wished to present to him or to use for himself, such as riding animals, camels and goods. They serve him with their wealth and their persons and stand before him like retainers. When he reaches the Sultan, the Sultan gives him a generous gift, and he pays off their debts and settles what is owed them. So their trade flourished and their profits grew, and this became a settled custom for them.