Yoma 55B

לית ליה כתיבה. דתנן, רבי יהודה אומר: לא היה שם אלא כן אחד בלבד. תרי מאי טעמא לא ⁠— משום דמחלפי. ונעביד תרי וליכתוב עלייהו הי דפר והי דשעיר. אלא, לרבי יהודה לית ליה כתיבה.

does not accept that one may rely on writing in a situation where an error is possible. As we learned in the Mishnah that R' Yehuda says: There was only one pedestal in the Temple on which to place the blood. What is the reason that they did not place two pedestals there? The reason is because the pedestals might be exchanged for one another, and he might take the goat’s blood instead of that of the bull. But in that case, let us place two pedestals and write on them which one is for the bull and which is for the goat. Rather, it is clear that R' Yehuda does not accept that one may rely on writing in a situation where error is possible.

מיתיבי: שלש עשרה שופרות היו במקדש, והיה כתוב עליהן: תקלין חדתין, ותקלין עתיקין, וקינין, וגוזלי עולה, ועצים, ולבונה, וזהב לכפורת, וששה לנדבה.

The Talmud raises an objection against this conclusion: There were 13 collection horns in the Temple, and they were each inscribed with different names. On one container was written: New shekels. In this horn they placed shekels that were donated at the correct time that year. And on another horn the phrase old shekels was written, referring to coins from the past year that did not reach the Temple during the allotted period. On the other horns, the following phrases were written: Nests, for obligatory offerings consisting of pairs of pigeons or turtledoves; young birds for burnt-offerings; wood, for anyone who wished to donate wood; frankincense; and gold for the Ark cover. And there were 6 additional boxes designated for communal free-will offerings of all kinds.