Several shuls were destroyed by this serious aveira (Mishna Berura 124:27). Even learning quietly is prohibited (ibid s”k 17). The Tosafot Yom Tov blamed the Khmelnytsky massacres on this and wrote a “misheberach” for “מי ששומר את פיו ולשונו לא לדר בזמן התפילה”. It is also prohibited to talk during keriat haTorah (SA 146:1) and the Haftarah (ibid seif 3).
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