(א) מִצְוַת עֲשֵׂה מִן הַתּוֹרָה לְבָרֵךְ אַחַר אֲכִילַת מָזוֹן שֶׁנֶּאֱמַר (דברים ח י) ״וְאָכַלְתָּ וְשָׂבָעְתָּ וּבֵרַכְתָּ אֶת יְיָ׳ אֱלֹהֶיךָ״. וְאֵינוֹ חַיָּב מִן הַתּוֹרָה אֶלָּא אִם כֵּן שָׂבַע שֶׁנֶּאֱמַר וְאָכַלְתָּ וְשָׂבָעְתָּ וּבֵרַכְתָּ. וּמִדִּבְרֵי סוֹפְרִים אָכַל אֲפִלּוּ כְּזַיִת מְבָרֵךְ אַחֲרָיו:
(1) It is a positive mitzvah from the Torah to bless [God] after eating satisfying food, as [Deuteronomy 8:10] states: "When you have eaten and are satiated, you shall bless God, your Lord."
The Torah itself requires a person to recite grace only when he eats to the point of satiation, as implied by the above verse, "When you have eaten and are satiated, you shall bless...." The Sages, however, ordained that one should recite grace after eating [an amount of bread equal] to the size of an olive.
- p. 49-50
- P. 26-27


