Of Cainan - This Cainan, the son of Arphaxad, and father of Sala, is not found in any other Scripture genealogy. See Genesis 10:24; Genesis 11:12; 1 Chronicles 1:18, 1 Chronicles 1:24, where Arphaxad is made the father of Sala, and no mention at all made of Cainan. Some suppose that Cainan was a surname of Sala, and that the names should be read together thus, The son of Heber, the son of Salacainan, the son of Arphaxad, etc. If this does not untie the knot, it certainly cuts it; and the reader may pass on without any great scruple or embarrassment. There are many sensible observations on this genealogy in the notes at the end of Bishop Newcome's Harmony.

Which was the son of Cainan,.... This Cainan is not mentioned by Moses in Genesis 11:12 nor has he ever appeared in any Hebrew copy of the Old Testament, nor in the Samaritan version, nor in the Targum; nor is he mentioned by Josephus, nor in 1 Chronicles 1:24 where the genealogy is repeated; nor is it in Beza's most ancient Greek copy of Luke: it indeed stands in the present copies of the Septuagint, but was not originally there; and therefore could not be taken by Luke from thence, but seems to be owing to some early negligent transcriber of Luke's Gospel, and since put into the Septuagint to give it authority: I say "early", because it is in many Greek copies, and in the Vulgate Latin, and all the Oriental versions, even in the Syriac, the oldest of them; but ought not to stand neither in the text, nor in any version: for certain it is, there never was such a Cainan, the son of Arphaxad, for Salah was his son; and with him the next words should be connected,

which was the son of Arphaxad; Genesis 11:12

which was the son of Sem, or Shem, Genesis 11:10

which was the son of Noe, or Noah, Genesis 5:32

which was the son of Lamech,

Which was the son of Cainan, which was the son of Arphaxad, which was the son of Sem, which was the son of Noe, which was the son of Lamech,

3:23-38 The Genealogy. For a comparison of the genealogies given by Matthew and Luke, see notes on Mt 1:1-17. In these notes I have followed Godet, Van Oosterzee, and others in the view that Luke gives the line of Mary, and therefore the line of Christ. Jesus was only supposed to be the son of Joseph, but was the son (i.e, descendant, grandson) of Heli, the father of Mary.

Margin Arphaxad

Arphaxad. Gen 10:22.

3:23-38 Matthew's list of the forefathers of Jesus showed that Christ was the son of Abraham, in whom all the families of the earth are blessed, and heir to the throne of David; but Luke shows that Jesus was the Seed of the woman that should break the serpent's head, and traces the line up to Adam, beginning with Eli, or Heli, the father, not of Joseph, but of Mary. The seeming differences between the two evangelists in these lists of names have been removed by learned men. But our salvation does not depend upon our being able to solve these difficulties, nor is the Divine authority of the Gospels at all weakened by them. The list of names ends thus, Who was the son of Adam, the son of God; that is, the offspring of God by creation. Christ was both the son of Adam and the Son of God, that he might be a proper Mediator between God and the sons of Adam, and might bring the sons of Adam to be, through him, the sons of God. All flesh, as descended from the first Adam, is as grass, and withers as the flower of the field; but he who partakes of the Holy Spirit of life from the Second Adam, has that eternal happiness, which by the gospel is preached unto us.