Abu Huraira reported God’s Messenger as saying, “An animal may be ridden for payment when it is in pledge and the milk of milch-camels may be drunk of payment when in pledge, payment being made by the one who rides and the one who drinks.”
Ibn 'Abbas said that when God’s Messenger came to Medina they were paying one, two and three years in advance for fruits, so he said, “Those who pay in advance for anything must do so for a specified measure and weight with a specified time fixed.”