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Genesis 17:19 - Isaac: Covenant's eternal heir?

Genesis 17:19 - בראשית 17:19

Hebrew Text

וַיֹּאמֶר אֱלֹהִים אֲבָל שָׂרָה אִשְׁתְּךָ יֹלֶדֶת לְךָ בֵּן וְקָרָאתָ אֶת־שְׁמוֹ יִצְחָק וַהֲקִמֹתִי אֶת־בְּרִיתִי אִתּוֹ לִבְרִית עוֹלָם לְזַרְעוֹ אַחֲרָיו׃

English Translation

And God said, Sara thy wife shall bear thee a son indeed; and thou shalt call his name Yiżĥaq: and I will establish My covenant with him for an everlasting covenant, and with his seed after him.

Transliteration

Va'yomer Elohim aval Sarah isht'cha yoledet lecha ben v'karata et-sh'mo Yitzchak vahakimoti et-briti ito livrit olam l'zar'o acharaiv.

Hebrew Leining Text

וַיֹּ֣אמֶר אֱלֹהִ֗ים אֲבָל֙ שָׂרָ֣ה אִשְׁתְּךָ֗ יֹלֶ֤דֶת לְךָ֙ בֵּ֔ן וְקָרָ֥אתָ אֶת־שְׁמ֖וֹ יִצְחָ֑ק וַהֲקִמֹתִ֨י אֶת־בְּרִיתִ֥י אִתּ֛וֹ לִבְרִ֥ית עוֹלָ֖ם לְזַרְע֥וֹ אַחֲרָֽיו׃
וַיֹּ֣אמֶר אֱלֹהִ֗ים אֲבָל֙ שָׂרָ֣ה אִשְׁתְּךָ֗ יֹלֶ֤דֶת לְךָ֙ בֵּ֔ן וְקָרָ֥אתָ אֶת־שְׁמ֖וֹ יִצְחָ֑ק וַהֲקִמֹתִ֨י אֶת־בְּרִיתִ֥י אִתּ֛וֹ לִבְרִ֥ית עוֹלָ֖ם לְזַרְע֥וֹ אַחֲרָֽיו׃

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Parasha Commentary

The Promise of Yitzchak's Birth

The verse (Bereishit 17:19) marks a pivotal moment in the covenant between Hashem and Avraham. Rashi explains that the word "אֲבָל" (indeed) serves to emphasize the certainty of Sarah's future pregnancy, countering Avraham's initial doubt due to their advanced age (as expressed in the previous verse). The Ramban adds that this reaffirmation underscores the miraculous nature of Yitzchak's birth, which would defy natural limitations.

The Significance of the Name Yitzchak

The name יִצְחָק (Yitzchak) carries profound meaning. Rashi notes it derives from the root צחק (laughter), reflecting both Avraham's joyous disbelief (Bereishit 17:17) and Sarah's later laughter (Bereishit 18:12). The Midrash (Bereishit Rabbah 53:8) teaches that this name signifies the joy Yitzchak would bring to the world, as he became a patriarch of the Jewish people.

The Eternal Covenant

Hashem's promise to establish an "בְּרִית עוֹלָם" (everlasting covenant) with Yitzchak is interpreted by the Rambam (Hilchot Melachim 9:1) as referring to the unique spiritual legacy passed through Yitzchak's lineage. The Talmud (Yevamot 64a) explains that this covenant specifically excludes Yishmael, as the divine plan would continue exclusively through Yitzchak's descendants.

  • Rashi: The covenant's eternity refers to its fulfillment through Yaakov and his twelve sons.
  • Sforno: The phrase "with his seed after him" indicates the covenant's continuity through all future generations of Jews.
  • Kli Yakar: The double language of "בְּרִיתִי... לִבְרִית" emphasizes both the Abrahamic and Sinaitic covenants that would flow from Yitzchak.

📚 Talmud Citations

This verse is quoted in the Talmud.

📖 Rosh Hashanah 11a
The verse is referenced in a discussion about the timing of Sarah's conception and the birth of Isaac, highlighting God's promise to Abraham.
📖 Sanhedrin 89b
The verse is cited in the context of discussing the covenant between God and Abraham, particularly focusing on the promise of Isaac's birth and the everlasting covenant with his descendants.

Frequently Asked Questions

Q: Why did God tell Avraham to name his son Yitzchak (Isaac)?
A: The name Yitzchak (יצחק) means 'he will laugh,' referring to Avraham's initial reaction of joyful disbelief when told he would have a child in old age (Genesis 17:17). Rashi explains that the name reflects the miracle of his birth to elderly parents, bringing happiness to all who heard about it.
Q: What is the significance of God establishing His covenant with Yitzchak?
A: This verse shows that God's covenant with Avraham would continue through Yitzchak, not Yishmael. The Rambam (Hilchos Melachim 10:7) teaches that this establishes Yitzchak as the spiritual heir who would carry forward Avraham's legacy of monotheism and righteousness.
Q: Why does the verse say Sarah will bear a son 'indeed' (אבל)?
A: The word 'aval' (אבל) here means 'certainly' or 'indeed,' emphasizing that despite Avraham's doubts due to their old age (Genesis 17:17), God would definitely fulfill this promise. The Midrash (Bereishis Rabbah 47:3) explains this word reinforces that the birth would be supernatural.
Q: How is this covenant with Yitzchak an 'everlasting covenant'?
A: The 'brit olam' (everlasting covenant) refers to the eternal bond between God and the Jewish people through Yitzchak's descendants. The Talmud (Yevamos 64a) explains this includes the mitzvos given at Sinai and the eternal promise of the Land of Israel to the Jewish nation.
Q: What lesson can we learn from God promising a son to elderly parents?
A: This teaches that nothing is impossible for God and that Divine promises are fulfilled in His time. The Sforno notes that this miracle established the principle that the Jewish people's existence transcends natural law, showing our special relationship with Hashem.