Tosefta for Pesachim 79:11
איתיביה רב פפא לרבא הקמחין והסלתות של נכרים של כפרים טהורים ושל כרכין טמאין
but barley, which is smooth, I would say that it is allowable. Therefore he informs us [otherwise]. Subsequently Raba said: It is permitted to wash [wheat].
Tosefta Pesachim
[Kernels of] wheat or barley that were soaked in water and became leavened -- behold, they are forbidden. Rabbi Yosei says, [kernels of] barley that were soaked in water and burst open, behold, they are forbidden; and [barley soaked] in vinegar, either way (i.e., whether they burst open or not), they are permitted because the vinegar contracts them (Pes. 40a:5).
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