English: “Take heed to yourself…” — “Take heed to yourself lest” is a negative commandment; “all your days” comes to include the sabbatical and jubilee years; “upon your land” — and not in exile.
On the daf / in context: The obligation to support the Levite continues even in years when the ordinary tithes are suspended, but it applies only while Israel is dwelling in the Land.
Type of Learning
Derash on the verse (Sifrei) — the scope and duration of the duty not to forsake the Levite.
What Is Learned
It is a negative commandment not to forsake the Levite; the obligation applies in shemittah and yovel as well, but only while dwelling in the Land.