“These are the descendants of Shem. When Shem was one hundred years old, he became the father of Arpachshad two years after the flood. Shem lived after the birth of Arpachshad five hundred years, and had other sons and daughters.”
Now we only interested in Shem as the other two sons of Noah fade away. At age of 100, 2 years after the flood, Shem has a son, Arpachshad, who was his third son, not the first born. Like the other genealogies he has other sons and daughters and died at the age of 600 years old.
“When Arpachshad had lived thirty-five years, he became the father of Shelah. Arpachshad lived after the birth of Shelah four hundred three years, and had other sons and daughters.”
Arpachshad at age 35 had a son, Shelah, but he also had other sons and daughters and died at the age of 438 years old.
“When Shelah had lived thirty years, he became the father of Eber. Shelah lived after the birth of Eber four hundred three years, and had other sons and daughters.”
Shelah at age 30 had a son, Eber, plus other sons and daughters and died at the age of 433 years old.
“When Eber had lived thirty-four years, he became the father of Peleg. Eber lived after the birth of Peleg four hundred thirty years, and had other sons and daughters.”
Eber at age 34 had a son, Peleg, plus other sons and daughters. There is no mention of Joktan and his thirteen Arab sons. Now Peleg seems more important, the reverse of the preceding chapter. Eber died at the age of 437 years old.
“When Peleg had lived thirty years, he became the father of Reu. Peleg lived after the birth of Reu two hundred nine years, and had other sons and daughters.”
Now the genealogy is into new territory. Peleg at age 30 had a son, Reu, plus other sons and daughters. Reu shows up in genealogies about Abraham. Peleg died at the age of 239 years old. Notice their lives are getting shorter.
“When Reu had lived thirty-two years, he became the father of Serug. Reu lived after the birth of Serug two hundred seven years, and had other sons and daughters.”
Reu at age 30 had a son, Serug, plus other sons and daughters. He died at the age of 237 years old.
“When Serug had lived thirty years, he became the father of Nahor. Serug lived after the birth of Nahor two hundred years, and had other sons and daughters.”
Serug at age 30 had a son, Nahor, plus other sons and daughters and died at the age of 230 years old.
“When Nahor had lived twenty-nine years, he became the father of Terah. Nahor lived after the birth of Terah a hundred nineteen years, and had other sons and daughters.”
Nahor is the name of Abram’s grandfather and his brother. At age 29 he had a son, Terah, plus other sons and daughters and died at the age of 138 years old.
“When Terah had lived seventy years, he became the father of Abram, Nahor, and Haran.”
Terah at age 70 had 3 sons, Abram, Nahor, and Haran. Nahor was the name of the father of Terah and his son also. More importantly, he was the father of Abram. So we have about 10 generations from Noah to Abram, about 400 years if you go by the first born.