The city of Arbah, (which is Hebron) - See Genesis 23:2. It has been conjectured that Jacob must have paid a visit to his father before this time, as previously to this he had been some years in Canaan; but now, as he was approaching to his end, Jacob is supposed to have gone to live with and comfort him in his declining days.

And Jacob came unto Isaac his father,.... No mention being made of his mother, it is very probable she was dead; and Isaac being alone, and very old, and the time of his death drawing nigh, he might send for Jacob to come with his family, and be with him; for it can hardly be thought that this was the first time of Jacob's visiting his father since he came into the land, of Canaan, which must be about ten years; but as yet he had not come with his family to him, and in order to abide with him:
unto Mamre, unto the city of Arbah, which is Hebron; Mamre was a plain, so called from the name of a man, a friend and confederate of Abraham, Genesis 13:18; where, or near to which, stood a city, called Kirjath Arbah, or the city of the four, Arbah and his three sons; so that it might be called Tetrapolls, and was later called Hebron:
where Abraham and Isaac sojourned; lived good part of their days, see Genesis 13:18; it was about twenty miles from Bethlehem, and the tower of Eder (k), where Jacob was last.
(k) Bunting's Travels, p. 72.

Jacob's arrival in "Mamre Kirjath-Arbah," i.e., in the terebinth-grove of Mamre (Genesis 13:18) by Kirjath-Arbah or Hebron (vid., Genesis 23:2), constituted his entrance into his father's house, to remain there as Isaac's heir. He had probably visited his father during the ten years that had elapsed since his return from Mesopotamia, though no allusion is made to this, since such visits would have no importance, either in themselves or their consequences, in connection with the sacred history. This was not the case, however, with his return to enter upon the family inheritance. With this, therefore, the history of Isaac's life is brought to a close. Isaac died at the age of 180, and was buried by his two sons in the cave of Machpelah (Genesis 49:31), Abraham's family grave, Esau having come from Seir to Hebron to attend the funeral of his father. But Isaac's death did not actually take place for 12 years after Jacob's return to Hebron. For as Joseph was 17 years old when he was sold by his brethren (Genesis 37:2), and Jacob was then living at Hebron (Genesis 37:14), it cannot have been more than 31 years after his flight from Esau when Jacob returned home (cf. Genesis 34:1). Now since, according to our calculation at Genesis 27:1, he was 77 years old when he fled, he must have been 108 when he returned home; and Isaac would only have reached his 168th year, as he was 60 years old when Jacob was born (Genesis 25:26). Consequently Isaac lived to witness the grief of Jacob at the loss of Joseph, and died but a short time before his promotion in Egypt, which occurred 13 years after he was sold (Genesis 41:46), and only 10 years before Jacob's removal with his family to Egypt, as Jacob was 130 years old when he was presented to Pharaoh (Genesis 47:9). But the historical significance of his life was at an end, when Jacob returned home with his twelve sons.

And Jacob came unto Isaac his father - We may suppose he had visited him before since his return, for he sore longed after his father's house, but never 'till now brought his family to settle with him, or near him. Probably he did this now upon the death of Rebekah, by which Isaac was left solitary.