Birkat Hamazon: Grace After Meals

Introduction
Birkat Hamazon is the traditional Jewish blessing known in English as the Grace After Meals. Its purpose is to thank God for providing food, for the Land of Israel, as well as for His unwavering kindness towards His people. Likewise, part of this blessing serves as a type of plea to the Lord, asking Him to swiftly rebuild the city of Jerusalem, for continued sustenance, and for the coming of the Messiah.
According to halacha (Jewish religious laws), one must say this blessing after eating a meal that includes an olive-sized piece of bread or matzah made from either wheat, rye, barley, spelt, or oats. This blessing is typically read to oneself, though many choose to sing it aloud as a community on Shabbat or biblical holidays.
Reciting Birkat Hamazon is considered a mitzvah and is based on the following verse from Deuteronomy 8:10:
“When you have eaten and are satisfied, you shall bless the Lord your God for the good land which He gave you.”
The Four Blessings
This blessing is broken up into four different parts and is usually initiated with a psalm. On Shabbat or other traditional feasts, Psalm 126 (Song of Ascents) is often read before Birkat Hamazon. During the weekdays, however, Psalm 137 is recited instead, though this practice is less common.
The first blessing out of the four parts is known as the “Birkat Hazan (ברכת הזן).” It is based on the blessing of thanksgiving given by Moses when the children of Israel received manna in the wilderness during the Exodus from Egypt.
The second blessing is called “Birkat Ha’aretz (ברכת הארץ),” and it is attributed to the blessing that Joshua said out of gratitude after he led the Israelites into the Promised Land. Additionally, this blessing thanks God for sustaining the Jewish people throughout history with food as well as with the Land of Israel.
The third part of the Birkat Hamazon concerns the rebuilding of Jerusalem and is accredited to King David, who made Jerusalem the capital, as well as King Solomon, who built the Temple there. “Birkat Boneh Yerushalayim (ברכת בונה ירושלים)” asks the Lord to be merciful towards the Jewish people while also requesting that the city of Jerusalem be rebuilt speedily and soon.
The final blessing is “Birkat Hatov V’hameitiv (ברכת הטוב והמטיב),” which was written by Gamliel the Elder in early First Century AD. Its purpose is to thank the Lord for His goodness and relationship with the Jewish people.
According to Rabbi Abraham Isaac Kook, an influential and famous rabbi in the 20th century, Birkat Hamazon can be depicted as a ladder of prayer. The first blessing speaks of personal needs, the second touches on the needs of the nation of Israel, the third discusses the Jewish people's spiritual yearnings through Jerusalem and the Temple, and the fourth part talks about the idea of being a light to the nations.
Another tradition associated with this blessing pertains to a group of at least three people that have eaten bread together. This forms a “zimmun (זימון),” and it obligates the group to say a few additional statements. The opening words are said by one of the three people, and it serves as a type of invitation for the others to join in on the recitation of Birkat Hamazon. If a minyan (ten or more people) is present, there are even more additions to the invitation.
There are many variations of the Birkat Hamazon depending on the sect of Judaism and the occasion (if it is recited during a specific holiday, brit milah, or wedding). Due to this, there may be words or verses that are either added or omitted. Nonetheless, below is the traditional version of this blessing, including the opening words said in the presence of a zimmun.
1. Preliminary Psalms
On weekdays (when tachanun is said), read Psalm 137:
Hebrew:
עַל נַהֲרוֹת בָּבֶל שָׁם יָשַׁבְנוּ גַּם בָּכִינוּ בְּזָכְרֵנוּ אֶת צִיּוֹן. עַל עֲרָבִים בְּתוֹכָהּ תָּלִינוּ כִּנֹּרוֹתֵינוּ. כִּי שָׁם שְׁאֵלוּנוּ שׁוֹבֵינוּ דִּבְרֵי שִׁיר וְתוֹלָלֵינוּ שִׂמְחָה שִׁירוּ לָנוּ מִשִּׁיר צִיּוֹן. אֵיךְ נָשִׁיר אֶת שִׁיר ה' עַל אַדְמַת נֵכָר. אִם אֶשְׁכָּחֵךְ יְרוּשָׁלִָם תִּשְׁכַּח יְמִינִי. תִּדְבַּק לְשׁוֹנִי לְחִכִּי אִם לֹא אֶזְכְּרֵכִי אִם לֹא אַעֲלֶה אֶת יְרוּשָׁלִַם עַל רֹאשׁ שִׂמְחָתִי. זְכֹר ה' לִבְנֵי אֱדוֹם אֵת יוֹם יְרוּשָׁלִָם הָאֹמְרִים עָרוּ עָרוּ עַד הַיְסוֹד בָּהּ. בַּת בָּבֶל