ציטירנדיקער פּירוש אויף הושע 2:11

“The tithes of your new grain and wine” [14:23]. The Holy One said to Israel: if you will give tithes, the grain is called your grain. However, if you will not give tithes, then the grain will be Mine, as the verse says, “I will take back My new grain in its time and My new wine in its season” [Hosea, 2:11]. This means, I will take My grain and My new wine, said God.²⁰Bahya, Deuteronomy, 14:23.

מעשר דגנך תירושך, “the tithe of your grain harvest, your grape harvest, etc.” It is only “your” grain harvest, if you tithe it; if not it is “My” grain harvest. The same applies to the grape harvest and the “oil” harvest. This interpretation is based on Hoseah 2,11: “Assuredly I will take back My new grain in its time and My new wine in its season, etc.”
שנה שנה, “year after year.” This means that one may not tithe from one year’s harvest for the following or the previous year’s harvest. Each harvest has to be tithed separately.