Mishnayos Taharos Perek 2 Mishnah 3

הראשון שבחולין טמא ומטמא – [defiles] heave-offering/priest’s due, that a loaf of heave-offering that came in contact with first-degree [of ritual impurity] of unconsecrated foods, becomes second-degree [of ritual impurity] and makes third-degree [of ritual impurity] unfit/invalid.

והשני שבחולין – makes heave-offering unfit/invalid but does not defile, for third-degree [of ritual defilement] of heave-offering does not make something fourth-degree [of ritual defilement], therefore third-degree [of ritual defilement] of heave-offering is not considered defiled, but rather unfit/invalid.

והשלישי של חולין – this is what he said and if there is in those unconsecrated foods third-degree [of ritual impurity] as, for example, that they became through the purification of heave-offering/priest’s due.

נאכל בנזיד הדמע (is consumed in a pottage of Holy Things)- in a cooked dish [that heave-offering] is mixed in, for the heave-offering/Terumah is called דמע/Holy Things (i.e., another name for Terumah) , as it is stated (Exodus 22:28): "מלאתך ודמעך לא תאחר [בכור בניך תתן-לי]"/You shall not put off the skimming of the first yield of your vats. [You shall give to Me the first-born among your sons],” and in the second chapter of [Tractate] Hullin (folio 34b), it proves that specifically, when there isn’t in the pottage of Holy Things an olive’s bulk of heave offering incidentally for consuming a certain quantity of bread (i.e., a piece, which is defined by the Tosefta Negaim, Chapter 7, Halakha 10 as half a loaf of which three make a Kab) that permits him to eat food which is third-degree [of ritual impurity], but if there is an olive’s bulk of heave-offering incidentally for consuming a certain quantity of bread (i.e., half a loaf), it is prohibited, for we hold that a person who consumes that which is third-degree [of ritual impurity] from unconsecrated food, that was made through the purification of Terumah/heave-offering, his body is made unfit from consuming heave-offering.