[If] someone had coins in Jerusalem and he needs them, and his friend has produce, he says to his friend: “These coins are hereby deconsecrated upon your produce.” It thus comes about that one eats his produce in taharah, while the other one makes use of his coins. But one should not say this to an am haaretz, except with demai.

One may not purchase terumah with money of maaser sheni, because he lessens its consumption. But R' Shimon permits. Said to them R' Shimon: If He was lenient with respect to shelamim offerings which leads to [prohibitions of] pigul, nosar, or tamei, shall we not be lenient with respect to terumah? They said to him: If He was lenient with respect to shelamim offerings which are permitted to non-Kohanim, shall we be lenient with respect to terumah, which is forbidden to non-Kohanim?