And you shall eat before Hashem your God, in the place that He will choose to make His Name dwell there, the tithe of your grain, of your wine and of your oil, and the firstborn of your herd and of your flock, in order that you may learn to fear Hashem your God all the days.
English: "All the days" — these are Shabbosos and Yomim Tovim.
On the daf / in context: The phrase is taken to include the possibility of separating ma’aser on the eve of Shabbos for produce that will be eaten on Shabbos itself.
Type of Learning
Derash on the verse (Beitzah) — "all the days" includes Shabbos and festivals.
What Is Learned
"All the days" refers especially to Shabbosos and festivals, permitting certain advance preparations of ma’aser for those days.