Commentary for Berakhot 61:2
רב אשי עבד הלולא לבריה חזנהו לרבנן דהוו קא בדחי טובא אייתי כסא דזוגיתא חיורתא ותבר קמייהו ואעציבו
Rab Ashe made a wedding-feast for his son, and noticed that the Rabbis were very merry. He seized a goblet of white crystal and broke it before them, and they became more serious.
Tosafot on Berakhot
HE BOUGHT A CUP OF WHITE GLASS. The Gemara relates that at the wedding of Rav Ashee’s son, Rav Ashee saw that the students were getting a bit too happy. He brought a very expensive cup and broke it in front of them in order to stem the overflow of happiness. From here, it became customary to break a cup at a wedding. This custom remains with us till today
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