Related for Taanit 32:6
במה דברים אמורים בגבולין אבל במקדש אינו כן לפי שאין עונין אמן במקדש ומנין שאין עונין אמן במקדש
The synagogue attendant calls out, Sound a Teru'ah,O ye children of Aaron, sound a Teru'ah. And likewise [he does] with the other benedictions, at one he calls out, sound a Teki'ah, and another, sound a Teru'ah. The order of service<span class="x" onmousemove="('comment',' Lit., 'in what are these said'.');"><sup>5</sup></span>
Tosefta Berakhot
The Beracha (blessing) of Zimun is from the Torah (i.e. a Torah obligation) as it is said, “And you should eat, and be satisfied, and bless…” (Deuteronomy 8:10), this is [a reference to] the Beracha of Zimun. “… Hashem, your God …” (Deuteronomy 8:10), this is [a reference to] the first Beracha [of Birkat Hamazon (Grace After Meals)]. “… for the land …” (Deuteronomy 8:10), this is [a reference to] the Beracha about the land (i.e. the second Beracha) [of Birkat Hamazon]. “… the good …” (Deuteronomy 8:10), this is [a reference to the Beracha about] Jerusalem (i.e. the third Beracha) [of Birkat Hamazon] as it is said “… this good mountain and Levanon.” (Deuteronomy 3:25). “… which He has given you.” (Deuteronomy 8:10), this is [a reference to the Beracha of] Hatov Vehameitiv (The Good and Who does good) (i.e. the fourth Beracha) [of Birkat Hamazon].
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