Genèse 24:62

And Izhak was coming from the school of the Rabba Shem, by the way of the fountain where had been revealed to him the Living and Eternal One, who seeth, and is not seen; and he resided in the land of the south.

AND ISAAC ‘BA MIBO’ (HAD JUST COME) FROM THE WELL LAHAI-ROI. Scripture states that Isaac had just now come from the well Lahai-roi, having returned from the well of Lahai-roi to which he had previously come. Had the verse stated, “Ba (he came) from the well of Lahai,” it would have appeared as if he lived there. Therefore, it was necessary to explain ba mibo as meaning that he returned to his city from the temporary visit that he had made to the well of Lahai-roi, for he abode in the south country and he was returning to his city.
It is possible that since the word mibo is an infinitive, it indicates that Isaac constantly went to that place since it was a place of prayer for him because of the revelation of the angel there, and he abode in the south country near there. And so did Onkelos translate it, “He came from his coming,” [thus indicating that he was in the habit of so doing].
In Onkelos’ opinion this was Beer-sheba for he translated both between Kadesh and Shur and between Kadesh and Bered, 16:14. as “Rekem and Chagra.” If so, that place — the place of the tamarisk-tree of Abraham — was suitable for prayer. Now Isaac came from that well while he was on his way to another city which was on the same road as his city, and he went out towards eventide to converse in the field with his companions and friends who were there. He met the servant and Rebekah, whereupon they all walked together to the city, and Isaac brought her into his mother Sarah’s tent.

ויצחק בא מבוא, an expression meaning the same as Genesis 10,19 בואכה סדומה. On that day, the day that Eliezer arrived, Yitzchok arrived from his visit to באר לחי רואי.

יושב בארץ הנגב, the area in which the באר לחי רואי is located. (compare Genesis 16,7 על העין בדרך שור.) seeing that he had come from there on that day. This detail is related to show that Yitzchok continued the work of his father who had planted an orchard in that vicinity. (Genesis 20,1) He had gone there to supervise his workers who were supposed to tend the orchard.

בא מבוא לחי ראי, to articulate a prayer at the spot where the prayer of his mother’s servant maid Hagar had been answered.

והוא יושב בארץ הנגב, Yitzchok personally resided to the south of that location; he had gone there only to attend to his business affairs, not to establish a new residence.

ויצחק, now the Torah tells us that Yitzchok encountered them as if by coincidence. The fact is, of course, that G’d arranges matters for the benefit of those whom He loves without their even being aware of it at the time.

בא מבוא, Yitzchok “happened” to come from that direction on that very day.

באר לחי רואי, he did not reside there, for he resided in Chevron with his father. This is the part known as ארץ הנגב, the southern part of the land. Yitzchok had either some herds or some other business which required him to travel to this place known as באר לחי רואי, from time to time. On the day that Eliezer was about to return to Chevron, he too was on the way there. The meaning of the word מבוא is “a place which one travels to from time to time.” Upon leaving באר לחי רואי on the way to Chevron, he would spend the night in one of the inns on the way from there to Chevron.