[If] one separates terumah before bikkurim, maaser rishon before terumah, [or] maaser sheni before [maaser] rishon, alt-hough he violates a negative commandment, what he did is done, As it is stated: Do not delay your fullness-offering or your “dema.”

And from where [do we derive] that bikkurim should precede terumah? [After all,] this is called “terumah” and “first,” and this is called “terumah” and “first”! Rather, bikkurim should precede [terumah] because they are “bikkurim” of all [the portions]; and terumah [should precede maaser] rishon because [terumah] is [called] “first”; and maaser rishon [should precede] maaser sheni, because [maaser rishon] contains “first.”’’