Related for Chullin 271:38
ראשית הגז אין נוהג אלא בארץ
What is R'Ila'i's reason? - Rab answered: He draws an analogy by means of the common expression 'giving' from terumah; as terumah obtains in the Land only and not outside it, so the law of the first of the fleece obtains in the Land only and not outside it.
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.
Ask RabbiBookmarkShareCopy