Isaac begat Jacob. The genealogy of Christ proceeds from Isaac, in the line of Jacob. Isaac begat Esau, as well as Jacob, and they two were twins, but one was loved, and the other hated; wherefore no mention is made of Esau, he had no concern in the Messiah, nor was he to spring from him, but from Jacob, or Israel, by whose name he is sometimes called, Isaiah 49:3
Jacob begat Judas and his brethren. The lineage of Christ is carried on from Jacob in the line of Judah; the reason of which is, because it was particularly prophesied that the Messiah, Shiloh, the prince and chief ruler, should be of him, Genesis 49:10 1 Chronicles 5:2. And it is evident beyond all contradiction, that our Lord sprung from his tribe, Hebrews 7:14. The reason why the brethren of Judah, who were eleven in number, are mentioned, when the brethren of Isaac and Jacob are not, is, because though the Messiah did not spring from them, yet the promise of him was made to the twelve tribes, who all expected him, and to whom he was sent, and came. These made but one body of men, and therefore, though the Messiah came from the tribe of Judah, yet he is said to be of them all, Romans 9:4.