Related for Menachot 83:8
ואי מדרבי יעקב הוה אמינא מלא קשר גודל דלא ליקרב טפי וכמה דרחיק מעלי צריכא
For from R'Papa's teaching I only know that it must be within three fingerbreadths' distance from the corner and not farther away than that, but the nearer it is [to the corner] the better; therefore R'Jacob's teaching was necessary. An from R'Jacob's teaching I only know that it must be away from the corner the distance of the first joint of the thumb and not nearer than that, but the farther away it is [from the corner] the better; therefore [both teachings] are necessary.
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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