Komentaryong Sumisipi para sa Genesis 25:19

וְאֵ֛לֶּה תּוֹלְדֹ֥ת יִצְחָ֖ק בֶּן־אַבְרָהָ֑ם אַבְרָהָ֖ם הוֹלִ֥יד אֶת־יִצְחָֽק׃

At ito ang mga salinlahi ni Isaac na anak ni Abraham: naging anak ni Abraham si Isaac.

Rashi

Adam, Seth, Enosh Ezra wrote this book of genealogy through Haggai, Zechariah, and Malachi during the eighteen years from the name that Zerubbabel and Joshua the Priest came to Jerusalem in the days of Cyrus I until Cyrus the son of Esther came. All of this [book] is for the [purpose of tracing the] lineage of King David and the Levites for gate sentries, guards, and singers, how David stationed them in their positions, and the priests in their watches. Therefore, he traced their lineage from Adam to Abraham, and since he had to trace Abraham’s lineage, he mentioned also the rest of the nations, his sons and his grandsons, and because of his sons, he had to trace the lineage of the rest of the nations, the sons of Canaan, to let [us] know how Abraham inherited their land. And since he had to mention and trace the lineage of the generations of Canaan, he mentioned together with them (the generations of) the rest of the nations, but he mentions them only briefly and casts them away until he reaches the main ones, as is explained in Genesis Rabbah (39:10) (See also Tanhuma Veyesheb 1). This can be compared to a king who was traveling from place to place and dropped a pearl. The king stood and sifted the sand with a sieve until he found the pearl. So said the Holy One, blessed be He, “Why should I trace the lineage of Shem and Arpachshad and Terach except to find Abraham?” [As it is written] (Neh. 9:8): “... and You found his heart faithful [before You].” And because of the honor of Isaac, he traced the lineage of the sons of Esau and Ishmael and the sons of Keturah, and he cast them away little by little and left them. He mentions the sons of Seir because the sons of Esau inherited them [i.e., their territory]; he also traces the lineage of Timna, who became a concubine to the seed of Abraham, to let us know the praise of Abraham, for she was the daughter of princes and chiefs and wished to be a concubine to the seed of Abraham, as it is written (Gen. 36:22): “... and Lotan’s sister was Timna,” and it is written (ibid. 12): “And Timna was a concubine to Eliphaz the son of Esau,” because she said, “If I am not worthy to marry him, I shall be his concubine.” (Gen. Rabbah 84: 14, Sanh. 99b) Moreover, for this reason, he traced the lineage of the sons of Seir because they were chiefs and princes, and Mount Seir belonged to Seir, but out of love for Isaac, the Holy One, blessed be He, gave it to Esau, as it is written (Deut. 2:12): “... and the children of Esau drove them out, etc., and settled in their place,” and to inform us of the fulfillment of the words of the Holy One, blessed be He, Who promised Isaac that He would multiply his seed and give him dominion over all, and because of the honor of Isaac he likewise wrote (verse. 31): “Now these are the kings who reigned in the land of Edom, etc.”
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Rabbeinu Bahya

ספר תולדות אדם, “the book relating the descendants of man.” According to Nachmanides this is an allusion to the entire Torah which is perceived as the ספר תולדות אדם. If it were not so, the Torah should not have used the expression ספר, “book,” but should simply have written אלה תולדות אדם, just as we find in Genesis 25,12 when the descendants of Ishmael are enumerated, or in Genesis 25,19 where the descendants of Yitzchak are listed.
Maybe the meaning of the word ספר in this instance is חכמה, “wisdom,” just as we find it in the ספר יצירה where the expression is ספר וספור as we already mentioned on a previous occasion. The “wisdom” referred to is not ordinary human wisdom but celestial wisdom, a wisdom which would have been man’s had he not sinned. The thrust of our verse then would be: “this book contains the wisdom which should have been an integral part of every human being.” The true descendants of man are not his biological children but his accomplishments in the field of Torah knowledge. The tasks that need to be performed on earth which require a human population could be carried out by someone other than man if need be. This is what Ben Azzai had in mind when he explained that he would not preoccupy himself with marrying and begetting children as his longing was concentrated solely on Torah (Yevamot 63). The complete verse therefore means: “for this book which represents the celestial wisdom, something that ought to belong to every human being seeing he had been created בדמות אלוקים עשה אותו, in the likeness of G’d He made him on the very day that G’d created man.” You will now understand why the Torah saw fit to mention the word אדם twice in this verse.
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Ramban

THIS IS THE BOOK OF THE GENERATIONS OF ADAM. These are the children He will mention in the chapter.473So Rashi and Ibn Ezra. In my opinion, this alludes to the entire Torah, for the entire Torah is the book of the generations of Adam. Therefore, He says here “book” and does not say, “And these are the generations of Adam,” as He says in other places, e.g. And these are the generations of Ishmael;474Genesis 25:12. And these are the generations of Isaac,475Ibid., Verse 19. and so in all such cases.
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