English: "You shall surely open" — I know only the poor of your own city; from where do I include the poor of another city? From the doubled language "open, you shall open"—in every place.
On the daf / in context: The emphatic infinitive expands the obligation beyond the local poor when resources permit.
Type of Learning
Derash on the verse (Bava Metzia) — the obligation extends to the poor of other cities.
What Is Learned
When one is able, the duty to open the hand applies also to the poor of other cities.