Additional concerns about foods becoming chametz - specifically, soaking barley or wheat kernals, and the moment at which that soaking becomes a problem, even if you did it inadvertently. But isn't all of this prohibited? The Gemara hazards a distinction between those who look to be more stringent and everybody else. The Gemara establishes several viewpoints, leaving us to ask: So is it prohibited, possible, or required to soak that wheat or barely?? Also: from when does one protect the wheat or its flour from water - and the implications of that requirement, including whether one can purchase wheat from a non-Jew, or use wheat that has become wet... Which leads the Gemara into a discussion of shaatnez... And what happens to anything a Jew might sell and then it might be sold back to a Jew - including, say, a blanket for a donkey's back, that could be used by the Jew down the road (though not shrouds). Would flour be sold back to a Jew if it were sold first to a non-Jew?