And the Levi shall come, for he has no portion or inheritance with you, and the stranger and the orphan and the widow who are within your gates, and they shall eat and be satisfied, in order that Hashem your God may bless you in all the work of your hand that you do.
English: "And the Levi shall come" — what is the force of "shall come"? Whenever he comes, give to him. From here we learn that ma’aser rishon never lapses.
On the daf / in context: Unlike ma’aser sheni and ma’aser ani, which alternate in different years of the cycle, ma’aser rishon is given every year whenever the Levi presents himself.
Type of Learning
Derash on the verse (Sifrei) — ma’aser rishon is perpetual.
What Is Learned
Ma’aser rishon is given every year; whenever the Levi comes one must give it to him.