 Like most of the tractates in Zeraim, it appears only in the Mishnah, and does not appear in the Babylonian Talmud, but rather in the Talmud Yerushalmi and Tosefta only.According to Maimonides' introduction to the Mishnah, the tractate of Challah is arranged after the tractate of Ma'aser Sheni, "because after we take out all of these gifts – which are 'terumah' and maaser rishon and [maaser] sheni – then we grind it and make it into flour and knead it, and then we become obligated in 'challah.