Kav

dough from Kav of old flour bitting into dough from Kav of new flour, from which do we separate challah? different if the two doughs are different varieties of flour

doughs exempted from challah (rice, terumah, terumah and chullin where the terumah part is more than one hundredth of the mixture ">medumah, belonging to no Jew) connecting other doughs which are obligated but are too small, do not combine to obligate in challah, doughs which are exempt (other species, belongs to another, new flour dough whose challah is taken) combining obligated doughs? Kav of hekdesh combines, Kav of challah does not combine

doughs of half Kav of wheat half Kav of barley with half Kav of spelt in the middle, Kav of wheat Kav of barley with Kav of spelt in the middle, Kav of wheat Kav of spelt with Kav of barley in the middle, laws from where to separate challah, differences between cases

four sages who entered Paradise (the study of maaseh merKava), one exited unscathed

make Kav portions of dough to evade obligation?

students of Rabban Yochanan ben Zakai studying maaseh merKava

teaching topics of forbidden relationships, creation of the world, maaseh merKavah, in certain sized groups, or sometimes not at all

three who explained maaseh merKava to their teachers

using arKavnin as maror

using arKavnin as maror