וְהִנֵּה־בֹ֗עַז בָּ֚א מִבֵּ֣ית לֶ֔חֶם וַיֹּ֥אמֶר לַקּוֹצְרִ֖ים יְהוָ֣ה עִמָּכֶ֑ם וַיֹּ֥אמְרוּ ל֖וֹ יְבָרֶכְךָ֥ יְהוָֽה׃
看哪,波阿斯從伯利恆來了,他對收割的人說:「願永恆者與你們同在!」他們回答他說:「願永恆者賜福給你!」
Tosefta Berakhot
The blessing after the meal is an obligation from the Torah, as it says “And you will eat and be sated, and you shall bless the Lord, your God, for the good land He has given you.” (Devarim 8:10) ’And you will eat and be sated, and you shall bless’ this refers to the blessing after the meal. ‘the Lord, your God’ refers to the first blessing on the land. ‘the good land’ this refers to Jerusalem, as it says “…this good mountain and the Lebanon.” (Devarim 3:25) ‘He has given you’ this refers to the blessing of ‘who is good and does good.’ From where do we learn that just as one is obligated to make a blessing before eating, so too they are obligated to make one after eating? The verse says ‘He has given you,’ meaning from the moment He has given it to you. From where do we learn that we bless even on the mountains and the hills? The verse says ‘on the land.’ From where do we learn that we bless even on the Torah and the commandments? The verse says ‘He has given you,’ and it says elsewhere “…and I will give you the stone tablets…” (Shemot 24:12) R’ Meir says ‘from where do we learn that just as one blesses on the good, so too they bless on the bad? The verse says ‘the Lord, your God…has given you’ “Your God,” meaning, “your Judge.” Bless Him for every judgement He passes on you, be it for the good or bad.