הָאוֹמֵר עַל קַן צִפּוֹר יַגִּיעוּ רַחֲמֶיךָ, וְעַל טוֹב יִזָּכֵר שְׁמֶךָ, מוֹדִים מוֹדִים, מְשַׁתְּקִין אוֹתוֹ. הָעוֹבֵר לִפְנֵי הַתֵּיבָה וְטָעָה, יַעֲבֹר אַחֵר תַּחְתָּיו, וְלֹא יְהֵא סָרְבָן בְּאוֹתָהּ שָׁעָה. מִנַּיִן הוּא מַתְחִיל, מִתְּחִלַּת הַבְּרָכָה שֶׁטָּעָה בָהּ:

One who says in prayer: "To the nest of a bird does Your compassion reach!" and "On the good shall Your Name be mentioned!" "Thank you, thank you"--silence him. One who leads the prayer service and makes a mistake—replace him with another. And one who is asked to serve as the replacement should not refuse at such a time. From where should he begin? From the beginning of the blessing in which the first one made a mistake.