Related for Chullin 271:64
הלוקח גז צאן עובד כוכבים פטור מראשית הגז הא צאנו לגזוז חייב
subject [to tithe], but the Sages declare it exempt.)
Tosefta Terumot
We do not take terumah from produce [that is harvested] before it is one-third ripe (cf. Hallah 1:3). How do you know if it is one-third ripe or if not? If it is planted and something has sprouted, it is known that it one-third ripe. If it is planted and something has not sprouted, it is known that it is not one-third ripe.
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