Reference for Bava Kamma 194:7

והתניא התקינו שיהו המעות יוצאות בירושלים מפני כך א"ר זירא לא קשיא כאן בזמן שיד ישראל תקיפה על אומות העולם כאן בזמן שיד אומות העולם תקיפה על עצמן

so also if they have currency in Babylon but are kept here.<span class="x" onmousemove="('comment',' In Jerusalem. ');">¹⁰</span> [But] where the coins have their currency in Babylon and are in Babylon redemption can be effected by means of them. Now, it is at all events stated here [is it not] that no redemption could be effected by means of coins which though having currency here<span class="x" onmousemove="('comment',' In Jerusalem. ');">¹⁰</span>

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