Demai 2:5-3:1
Demai 2:5
Rabbi Meir says that if something normally sold in bulk is sold in a small quantity, it still follows the rules of something sold in bulk (and demai need not be tithed). If something normally sold in a small quantity is sold in bulk, it follows the rule of the small quantity (and demai must be tithed). What’s bulk? For things sold in dry measures, three kav (about six liters) and for liquids, one dinar’s worth. Rabbi Yosi says that baskets of figs, grapes or vegetables that are sold based on volume are also exempt from tithing demai.
Demai 3:1
One may give demai to the needy to eat, as well as to soldiers whom the populace were required to feed. Rabban Gamliel used to give demai to his workmen (whom he was required to feed). Beis Shammai say that charity distributors should give tithed foods to those who will not take tithes and untithed foods to those who will take tithes, with the result that everyone will end up eating tithed food. The Sages, however, say that the charity officers collect the food no questions asked and distribute the food no questions asked. Those who are inclined to take tithes will do so.