סימן קכט סעיף טז
בַּחֲזָרַת הַתְּפִלָּה, כְּשֶׁאוֹמֵר שְּׁלִיחַ הַצִבּוּר וַאֲנַחְנוּ כּוֹרְעִים, נוֹהֲגִין שֶׁגַם הַצִּבּוּר אוֹמְרִים עִמּוֹ, וְגַם כּוֹרְעִים וּמִשְׁתַּחֲוִים, אֲבָל אֵין נוֹפְלִים עַל פְּנֵיהֶם, רַק בְּיוֹם הַכִּפּוּרִים בְּסֵדֶר הָעֲבוֹדָה. וְגַם שְּׁלִיחַ הַצִבּוּר כּוֹרֵעַ עַל בִּרְכָּיו, אֲבָל אָסוּר לַעֲקֹר מִמְּקוֹמוֹ בִּשְׁעַת הַתְּפִלָּה. וְלָכֵן נוֹהֲגִין שֶׁיַּעֲמֹד קְצָת רָחוֹק מִן הָעַמּוּד, כְּדֵי שֶׁיּוּכַל לִכְרֹעַ עַל בִּרְכָּיו בְּלִי עֲקִירָה מִמְּקוֹמוֹ, וְהָעוֹמְדִים אֶצְלוֹ מְסַיְּעִים אוֹתוֹ לַעֲמוֹד, שֶׁלֹּא יִצְטָרֵךְ לַעֲקֹר רַגְלָיו. הַתְּקִיעוֹת שֶׁבְּתוֹךְ חֲזָרַת הַתְּפִלָּה, אֵין לִשְּׁלִיחַ הַצִבּוּר לִתְקֹעַ, אֶלָּא אִם הוּא בָּטוּחַ שֶׁלֹּא תִּתְבַּלְבֵּל דַּעְתּוֹ עַל יְדֵי כָּךְ (קלה תקפה תרכא).
During the repetition of the Shemoneh Esrei when the Chazzan recites [the prayer] Va'anachnu kore'im [But we bow], it is customary for the congregation to say it along with him, and the people also bow and prostrate themselves, but they do not fall on their faces,15It is our custom, however, that the people in the congregation do fall on their faces even on Rosh Hashanah. We must be careful to place a mat, towel or another object on the floor because it is forbidden to fall on our faces directly on the floor. (See Shaarei Tzion 131:44; Mishnah Berurah 621:14; Ibid 131:40) except on Yom Kippur, during the Avodah [the service of the Kohein gadol.] The Chazzan also bows, but since he is forbidden to move from his place during the Shemoneh Esrei; therefore, he stands slightly removed from the amud [Chazzan's desk] so that he can fall to his knees without moving from his place, and those who stand near him help him stand up so that he will not have to move his feet. The Tekios during the repetition of the Shemoneh Esrei should not be blown by the Chazzan unless he is sure that he will not be confused [in his prayers]16In our time, since the Chazzan uses the Siddur or Machzor, he is considered as one who is sure not to become confused in his prayers. (Ibid 585:14) as a result of it.
תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)