Related for Beitzah 69:11

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]."