Peah 2:6-7

Peah 2:6

On one occasion, Rabbi Shimon of Mitzpah planted two types of wheat in the presence of Rabban Gamliel. They went to where the Sanhedrin met and inquired. Nachum the scribe said that he received a tradition from Moses at Sinai, passed to him by Rabbi M’yasha, who received it from his father, who received it from the “zugos” (pairs of scholars), who received it from the prophets, regarding one who plants two types of wheat. Namely, if one threshes them together in one threshing floor, he gives one peah; if he threshes them separately in two threshing floors, he gives peah for each.

Peah 2:7

If non-Jews reaped a field (for themselves, not for the owner), or if bandits reaped it, of if the crops were broken off by insects, the wind or cattle, it is exempt from peah. If the owner reaped half the field and bandits reaped the other half, the field is exempt because the obligation to give peah applies to standing grain (i.e., the field becomes obligated at the end of the reaping, so if bandits finished the job, the field is exempt).