Reference for Berakhot 48:2

מיתיבי המשמיע קולו בתפלתו הרי זה מקטני אמנה המגביה קולו בתפלתו הרי זה מנביאי השקר

Against this is quoted : He who makes his voice heard during prayer is of the small of faith; he who raises his voice when praying is of the prophets of falsehood; he who belches and yawns [during prayer] is of the proud of spirit;

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