Antiquities of the Jews
Chapter 14.
CONCERNING SARAH ABRAHAM'S WIFE; AND HOW SHE ENDED HER DAYS. FJAJ 1.71
NOW Sarah died a little while after, having lived one hundred and twenty-seven years
They buried her in Hebron; the Canaanites publicly allowing them a burying-place; which piece of ground Abraham bought for four hundred shekels, of Ephron, an inhabitant of Hebron
And both Abraham and his descendants built themselves sepulchers in that place.
FJAJ 1.72