Mishnà su Levitico 22:9

In the case of hallah and terumah:One is liable for death on account of [having eaten] them death [intentionally], or to [repay] an added fifth [if unwittingly]; They are forbidden to non-priests; They are the property of the priest; They are nullified [in a mixture of] one-hundred-and-one [parts, the rest being non-sacred dough or produce]; They require washing of one’s hands; And [waiting until] the setting of the sun [prior to eating them]; They may not be separated from pure [stuff] for impure; But rather from that which is close, And from that [in a] finished [state]. If one said: “All my threshing-floor is terumah, or all my dough is hallah,” he has not said anything, unless he has left some over.