Reference for Avodah Zarah 104:13
התם לא אשתמשו בהו לגבוה הכא כיון דאשתמש בהו לגבוה לאו אורח ארעא לאשתמושי בהו הדיוטא:
There [in the case of the coins] they had not been used to worship God; but here [in the case of the altar-stones], since they had been used to worship God it would not be respectful to put them to a secular use.
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