שולחן ערוך אורח חיים · סימן קל״ג

English

The Laws of Bar'khu on Shabbat. Containing 1 Se'if: On Shabbat and Yom Tov we don't say Bar'khu after the last Kaddish. Gloss: Even in a place where they say it on ordinary days [because] perhaps there were individuals who were not in the synagogue when they said [the initial] Bar'khu; nevertheless, on Shabbos and Yom Tov we don't say it because everybody comes to synagogue before Bar'khu. [Beit Yosef in the name of the Rivash]