And among the followers of the Book there are some such that if you entrust one ( of them ) with a heap of wealth , he shall pay it back to you ; and among them there are some such that if you entrust one ( of them ) with a dinar he shall not pay it back to you except so long as you remain firm in demanding it ; this is because they say : There is not upon us in the matter of the unlearned people any way ( to reproach ) ; and they tell a lie against Allah while they know .