[Avodah] pitum haketores

[Gilad Field]

Anyone know of the source for some minhag I have seen where people have the
pitum haketores written on a klaf in ksav ashuris? I have even seen it
posted on a shul (where you would normally see modim d'rabanan or the
like).  Is there any mekor for this in shas or the rishonim?

thanks,
gilad
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