Related do Terumot 6:9

Rabbi Yosei says, one who pays [the penalty for partaking of forbidden terumah shall pay] a fifth and a fifth of that fifth [if he partook of that fifth, see Ter. 6:1].

One who eats, one who drinks, and one who anoints himself with terumah [unwittingly must repay its value and a fifth (Ter. 6:1)]. If he ate [terumah] and came back and ate again, if the time [that elapsed from] when he started eating until he finished eating is less than the amount of time to eat a p'ras (half a loaf of bread), [the two acts of eating] join together [for purposes of liability], and if not, they do not join together. If he drank [terumah] and came back and drank again, if [the elapsed time] from the first drinking to the last drinking is less than the amount of time to drink a revi'it (a quarter-log), [the two acts of drinking] join together, and if not, they do not join together. [Moreover,] just as eating an olive's bulk [triggers liability], so too drinking an olive's bulk [triggers liability]. Eating and drinking do not join together [for purposes of liability]. If he ate an olive's bulk, even from five different types of food, behold, all these join together [if all the eating was in a short time period]. If he ate half of an olive's bulk, and it became known to him [that he was eating terumah], and then he came back and ate another half of an olive's bulk [of terumah] afterwards from a different kind [of food], behold, these do not combine.

One who steals terumah [or] dedicated [produce] but does not eat it pays the principal but does not pay the fifth (i.e., the penalty for misuse of terumah), or double the principal (but see Ter. 6:4), as it is said (Ex. 22:8), "he double to his neighbor," but [it does] not [say double] for dedicated [produce]. [If] he ate the terumah, he pays double the principal and a fifth -- a principal and a fifth from nonconsecrated produce -- and they render it holy like terumah -- and the principal he gives to the treasurer, and the fifth he gives to the property owner [from whom he stole].

One who eats untithed produced makes repayment from the gleanings, from the forgotten sheaves, from the peah (the corners of the field set aside for the poor), and from produce that has not grown at least a third, the words of Rabbi Eliezer. [But] Rabbi Akiva says, we do not make repayment with something that is not subject to tithes. [On the subject of eating untithed produce,] said Rabbi Natan, "Rabbi Eliezer would say, [with respect to one who began casually eating a cluster of untithed grapes in the field (see Ter. 8:3, Beitzah 35a:10-11)], he is permitted to wait until the arrival of the Sabbath and exit the courtyard and finish [eating them in the field]."