Two things especially are observable in this account of the posterity of Shem: -

I.The description of Shem, Gen 10:21. We have not only his name, Shem, which signifies a name, but two titles to distinguish him by: -

1.He was the father of all the children of Eber. Eber was his great grandson; but why should he be called the father of all his children, rather than of all Arphaxad's, or Salah's, etc.? Probably because Abraham and his seed, God's covenant-people, not only descended from Heber, but from him were called Hebrews; Gen 14:13, Abram the Hebrew. Paul looked upon it as his privilege that he was a Hebrew of the Hebrews, Phi 3:5. Eber himself, we may suppose, was a man eminent for religion in a time of general apostasy, and a great example of piety to his family; and, the holy tongue being commonly called from him the Hebrew, it is probable that he retained it in his family, in the confusion of Babel, as a special token of God's favour to him; and from him the professors of religion were called the children of Eber. Now, when the inspired penman would give Shem an honourable title, he calls him the father of the Hebrews. Though when Moses wrote this, they were a poor despised people, bond-slaves in Egypt, yet, being God's people, it was an honour to a man to be akin to them. As Ham, though he had many sons, is disowned by being called the father of Canaan, on whose seed the curse was entailed (Gen 9:22), so Shem, though he had many sons, is dignified with the title of the father of Eber, on whose seed the blessing was entailed. Note, a family of saints is more truly honourable than a family of nobles, Shem's holy seed than Ham's royal seed, Jacob's twelve patriarchs than Ishmael's twelve princes, Gen 17:20. Goodness is true greatness.

2.He was the brother of Japheth the elder, by which it appears that, though Shem is commonly put first, he was not Noah's first-born, but Japheth was older. But why should this also be put as part of Shem's title and description, that he was the brother of Japheth, since it had been, in effect, said often before? And was he not as much brother to Ham? Probably this was intended to signify the union of the Gentiles with the Jews in the church. The sacred historian had mentioned it as Shem's honour that he was the father of the Hebrews; but, lest Japheth's seed should therefore be looked upon as for ever shut out from the church, he here reminds us that he was the brother of Japheth, not in birth only, but in blessing; for Japheth was to dwell in the tents of Shem. Note, (1.) Those are brethren in the best manner that are so by grace, and that meet in the covenant of God and in the communion of saints. (2.) God, in dispensing his grace, does not go by seniority, but the younger sometimes gets the start of the elder in coming into the church; so the last shall be first and the first last.

II.The reason of the name of Peleg (Gen 10:25): Because in his days (that is, about the time of his birth, when his name was given him), was the earth divided among the children of men that were to inhabit it; either when Noah divided it by an orderly distribution of it, as Joshua divided the land of Canaan by lot, or when, upon their refusal to comply with that division, God, in justice, divided them by the confusion of tongues: whichsoever of these was the occasion, pious Heber saw cause to perpetuate the remembrance of it in the name of his son; and justly may our sons be called by the same name, for in our days, in another sense, is the earth, the church, most wretchedly divided.

Shem also, the father of all the children of Eber - It is generally supposed that the Hebrews derived their name from Eber or Heber, son of Shem; but it appears much more likely that they had it from the circumstance of Abraham passing over (for so the word עבר abar signifies) the river Euphrates to come into the land of Canaan. See the history of Abraham, Gen 14:13 (note).

Unto Shem also, the father of all the children of Eber,.... And for the sake of those Shem is particularly said to be the father of, is this genealogy given, and indeed the whole book of Genesis wrote: Eber was the great-grandson of Shem, and is here spoken of by anticipation, and Shem is called not the father of either of his immediate sons, but of the posterity of this man; because the Hebrews sprung from him in his line, among whom the church of God and the true religion were preserved, and from whom the Messiah was to come, as he did: the word Eber, Jarchi interprets, "beyond the river, Euphrates" or "Tigris", or both, as describing the seat of the posterity of Shem; but as this too much straitens them, since they inhabited on both sides, Dr. Hyde (d) has shown that the word used may refer to both, to those beyond these rivers, and to those on this side; see Num 24:24.

the brother of Japheth the elder; he was the brother of Ham too, but he is not mentioned because of the behaviour towards his father, and because of the curse that was upon him and his; but Shem's relation to Japheth is expressed to show that they were alike in their disposition; and it may be to signify, that in times to come their posterity would unite in spiritual things, which has been fulfilled already in part, and will be more fully by the coalition of the Jews, the posterity of Shem, and of the Gentiles, the posterity of Japheth, in the Christian church state: and from hence we learn that Japheth was the eldest of Noah's sons, though some render the words, "the elder brother of Japheth" (e); and so make Shem to be the eldest; but as this is contrary to the accents, so to the history: for Noah was five hundred years old when he began to beget sons, Gen 5:32 he was six hundred when he went into the ark, Gen 7:11 two years after the flood Shem begat Arphaxad, when he was one hundred years old, and Noah six hundred and two, Gen 11:10 so that Shem must be born when Noah was five hundred and two years old; and since he begot children, there must be one two years older than Shem, which can be no other than Japheth, since Ham is called his younger son, Gen 9:24.

even to him were children born, who are reckoned as follow.

(d) Hist. Relig. Pers. c. 2. p. 47, 48. (e) "fratre Japheth majore". V. L. Samar. Syr. Ar. "frater major natu ipsius Japheth", Tigurine version; "fratri Japheti majori", Cocceius; so some in Vatablus.

Unto Shem--The historian introduces him with marked distinction as "the father of Eber," the ancestor of the Hebrews.