And these are the days of the years of Abraham’s life which he lived, an hundred threescore and fifteen years.
Abraham's 175 years of life extended until Jacob and Esau were 15 years old. Isaac lived on much longer, until Jacob and Esau were 120, so their overlapping lifetimes meant there were no long unbridged gaps between generations. What God had taught Adam was thus handed down directly from person to person. Adam imparted that knowledge to Methuselah, Methuselah passed it to Shem, Shem passed it to Abraham and Isaac, and Abraham and Isaac passed it to Jacob, the father of the tribes of Israel.
Abraham's 175 years of life extended until Jacob and Esau were 15 years old. Isaac lived on much longer, until Jacob and Esau were 120, so their overlapping lifetimes meant there were no long unbridged gaps between generations. What God had taught Adam was thus handed down directly from person to person. Adam imparted that knowledge to Methuselah, Methuselah passed it to Shem, Shem passed it to Abraham and Isaac, and Abraham and Isaac passed it to Jacob, the father of the tribes of Israel.