Commentary for Avodah Zarah 130:11
תנן יין נסך שנפל ע"ג ענבים ידיחן והן מותרות ואם היו מבוקעות אסורות מבוקעות אין שאין מבוקעות לא אמר רב פפא שאני חיטי הואיל ואגב צירייהו כמבוקעות דמיין
We learned: If yayin nesekh fell upon grapes, one may rinse them and they are permitted, but if they were split they are prohibited. If they are split they are [prohibited], but if not split they are not! Papa said: Wheat is different because of its slits it is as if it is split.
Daf Shevui to Avodah Zarah
Although the wheat is not actually split like the grapes, since wheat grains naturally have a slit in them, they are always considered as if they are split.
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