Bezalel and the Early Generations Who Fathered at Eight

"Forty years old was I" (Joshua 14:7). We learn from here that in the earlier generations they begot children at the age of eight, as it is written, "and Azubah the wife of Caleb died, and Caleb took to him Ephrath, who bore him Hur" (1 Chronicles 2:19), and it is written, "and Bezalel the son of Uri, the son of Hur, of the tribe of Judah" (Exodus 31:2; 38:22). Now when Bezalel made the Tabernacle, how old was he? Thirteen, as it is written, "every man according to his work which they did" (Exodus 36:4). And it was taught: in the first year Moses made the Tabernacle, in the second it was set up and he sent the spies, and it is written, "forty years old was I when Moses the servant of the LORD sent me" (Joshua 14:7). Subtract the fourteen that Bezalel was, and there remain twenty-six; subtract two for the three births that overlap, and it is found that each one begot at eight.