משנה על נדרים 5:2

All of these divide in the case of a field [planted] with seeds, but in the case of trees nothing divides except a fence. Should the branches intertwine [on top of the fence], then it does not divide and he gives one peah for the whole field.

Originally all who knew how to recite would recite while those who did not know how to recite, others would read it for them [and they would repeat the words]. But when they refrained from bringing, they decreed that they should read the words to both those who could and those who could not [recite so that they could repeat after them].

One who vowed [that his friend could not benefit from him] unless he eats with him, and the friend does not trust him in respect of tithes, he may eat with him on the first Shabbat even though he does not trust him in respect of tithes, provided that his friend said to him that the food had been tithed. But on the second week, even though he had vowed that he would not benefit from him, he may not eat with him unless he first tithed [the produce].