Reference for Menachot 213:3

והאיכא מנחת נסכים כיון דאיכא מנחה דאכלי כהנים מינה לא פסיקא ליה:

[IF A MAN SAID,] 'I TAKE UPON MYSELF TO OFFER GOLD', HE MUST BRING NOT LESS THAN A GOLDEN DENAR'Perhaps he meant a bar [of gold]! - R'Eleazar said, [We must suppose that] he said [gold] coin. Perhaps he meant small gold coins! - R'Papa said, Small gold coin is not usually made.

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