(1) Sarah’s lifetime—the span of Sarah’s life—came to one hundred and twenty-seven years.(2)Sarah died in Kiriath-arba—now Hebron—in the land of Canaan; and Abraham proceeded to mourn for Sarah and to bewail her.(3) Then Abraham rose from beside his dead, and spoke to the Hittites, saying,(4) “I am a resident alien among you; sell me a burial site among you, that I may remove my dead for burial.”(17) So Ephron’s land in Machpelah, near Mamre—the field with its cave and all the trees anywhere within the confines of that field—passed(18) to Abraham as his possession, in the presence of the Hittites, of all who entered the gate of his town.(19)And then Abraham buried his wife Sarah in the cave of the field of Machpelah, facing Mamre—now Hebron—in the land of Canaan.(20) Thus the field with its cave passed from the Hittites to Abraham, as a burial site.

(7) This was the total span of Abraham’s life: one hundred and seventy-five years.(8) And Abraham breathed his last, dying at a good ripe age, old and contented; and he was gathered to his kin.(9)His sons Isaac and Ishmael buried him in the cave of Machpelah, in the field of Ephron son of Zohar the Hittite, facing Mamre,(10) the field that Abraham had bought from the Hittites; there Abraham was buried, and Sarah his wife.

(1) בקרית ארבע literally, the city of the Four, and it was so called because of the four giants who lived there: Ahiman, Sheshai, Talmai and their father (Numbers 13:22). Another explanation is that it was so called because of the four couples who were buried there, man and wife — Adam and Eve, Abraham and Sarah, Isaac and Rebecca, Jacob and Leah (Genesis Rabbah 58:4).

(2) ואחרי כן קבר אברהם את שרה אשתו אל מערת המכפלה...היא חברון בארץ כנען. “After this, Avraham buried his wife Sarah in the cave of Machpelah. which is in Chevron in the land of Canaan.” The Torah goes to great lengths to describe the location of this field and its adjacent cave in great detail...

An additional reason for describing this location in such detail was so that we should be aware of where our patriarchs have been buried, in order to honour their memory on the occasions when we are obligated to honour the dead of our people who had led sainted lives by visiting their graves.

...Adam said: Whilst I am yet alive I will build for myself a mausoleum to rest therein. He planned and built for himself a mausoleum to rest therein beyond Mount Moriah. Adam said: If in the case of the tablets (of stone), just because in the future they will be written by the finger (of God), the waters of the Jordan are destined to flee before them; how much more so will this be the case with my body which His two hands kneaded, and because He breathed into my nostrils the breath of the spirit of His mouth? After my death they will come and take my bones, and they will make them into an image for idolatry; but verily I will put my coffin deep down beneath the cave and within the cave. Therefore it is called the Cave of Machpelah, which is a double cave. There Adam was put and his help-meet, Abraham and his help-meet, Isaac and his help-meet, Jacob and his help-meet. Therefore it is called "the city of four" (Kirjath Arba'); for four pairs (were buried there), and concerning them the verse says, "He enters into peace; they rest in their beds, each one that walks in his up-rightness" (Isa. 57:2).

(5) So Moses the servant of the LORD died there, in the land of Moab, at the command of the LORD.(6) He buried him in the valley in the land of Moab, near Beth-peor; and no one knows his burial place to this day.

עד היום הזה, “until this day.” The principal reason for this is to make it impossible for anyone to be buried next to him. This was in order to prevent necromancers from using this site for their purposes.

...so that his place of burial should not be known to anyone. And Hashem did this since if his burial place were known, perhaps someone in future generations might err and turn him into a god.

(10) Let no one be found among you who consigns his son or daughter to the fire, or who is an augur, a soothsayer, a diviner, a sorcerer,(11) one who casts spells, or one who consults ghosts or familiar spirits, or one who inquires of the dead.

Rabban Shimon ben Gamliel says, "We do not make grave markers for tzadikim [righteous people]. Their words are their memorial."

(4) One should not visit the graves.

For a cemetery is the resting place of tzadikim (righteous people), and prayers are better accepted there. But don't aim your intentions towards the dead, but rather request of the Holy One, May He be Blessed, to have mercy on you in the merit of the tzadikim in the earth there. And encircle the cemetery, and give tzedakah (charity) before you make your pleas. And do not go to a grave twice in a single day.

This was the total span of Abraham’s life: one hundred and seventy-five years. And Abraham breathed his last, dying at a good ripe age, old and contented; and he was gathered to his kin. His sons Isaac and Ishmael buried him in the cave of Machpelah, in the field of Ephron son of Zohar the Hittite, facing Mamre, the field that Abraham had bought from the Hittites; there Abraham was buried, and Sarah his wife.

(27) And Jacob came to his father Isaac at Mamre, at Kiriath-arba—now Hebron—where Abraham and Isaac had sojourned.(28) Isaac was a hundred and eighty years old(29) when he breathed his last and died. He was gathered to his kin in ripe old age; and he was buried by his sons Esau and Jacob.