Jabir said he intended to go to Khaibar, so he went to the Prophet, gave him a salutation and told him of his purpose. He replied, “When you come to my agent take fifteen camel-loads from him, and if he desires a sign from you put your hand on his collar-bone*”.
*This was evidently a pre-arranged sign to show that the Messenger was genuine.
Abu Huraira traced to the Prophet the statement that God who is great and glorious says, “I make a third with two partners as long as one of them does not cheat the other, but when he cheats him I depart from them."
Abu Dawud transmitted it and Razin added, “and the devil comes."