[If] someone sells fruits in Surya, and says: ‘‘They are from the Land of Israel,’’ one is ob-ligated to tithe [them]. [But if he adds:] ‘‘They are tithed,’’ he is believed, because the very mouth that has forbidden is the mouth that has permitted. [If he says:] ‘‘They are from my property,’’ one is obligated to tithe [them]. [But if he adds:] ‘‘They are tithed,’’ he is believed, because the very mouth that has forbidden is the mouth that has permitted. If, however, it is known that he has [at least] one field in Surya, one is obligated to tithe [the fruits].