Reference for Pesachim 79:4
ת"ר אין לותתין שעורין בפסח ואם לתת נתבקעו אסורות לא נתבקעו מותרות
if upright, it is forbidden.<span class="x" onmousemove="('comment',' Because the sap is retained in the vessel.');"><sup>5</sup></span> Raba said: Even if upright it is still permitted [because] it is the sap of fruit, and sap of fruit does not cause fermentation. Our Rabbis taught: One may not wash<span class="x" onmousemove="('comment',' The verb connotes to moisten the grain before grinding.');"><sup>6</sup></span>
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