They [who consumed terumah] may not pay with leket, with shich'chah, with pe'ah, or with ownerless produce; and not with maaser rishon whose terumah has been removed, and not with maaser sheini or consecrated produce that have been re-deemed, because holy property cannot [be used to] redeem holy property. [These are] the words of R' Meir. But the Sages permit [paying] with these.