From Bible Encyclopedia
The wife and at the same time the half-sister of Abraham (Genesis 11:29; Genesis 20:12). This name was given to her at the time that it was announced to Abraham that she should be the mother of the promised child. Her story is from her marriage identified with that of the patriarch till the time of her death. Her death, at the age of one hundred and twenty-seven years (the only instance in Scripture where the age of a woman is recorded), was the occasion of Abraham's purchasing the cave of Machpelah as a family burying-place.