English: "And you shall bind up" — "and you shall bind up" includes any object that bears a form; from here we learn that ma’aser sheni may not be redeemed upon an unstamped blank (asimon).
On the daf / in context: Only a coin that carries an imprint (or writing) may be used for the redemption of ma’aser sheni.
Type of Learning
Derash on the verse (Bava Metzia) — redemption requires a coined form.
What Is Learned
Ma’aser sheni may be redeemed only upon a coin that bears a stamped form; an unstamped blank is invalid.