The measure of challah is one twenty-fourth [of the dough]. [For] one who makes a dough for himself, and [for] one who makes [a dough] for his son's feast, [the measure is] one twenty-fourth. [For] a baker who is making [bread] to sell at the market, and, likewise, [for] a woman who is making [bread] to sell at the market, [the measure is] one forty-eighth.  [If] her dough became tamei mistakenly or accidentally, [the measure is] one forty-eighth. [If] it became tamei intentionally, [the measure is] one twenty-fourth, so that the transgressor should not profit [from her transgression].