Rashi on Genesis 26:12/רש"י על בראשית כ״ו:י״ב

1בארץ ההוא IN THAT LAND although it (Gerar) had not the sacred importance of Erez Yisroel proper — i. e., as the territory of the seven nations, and is therefore not as fertile as the Holy Land (cf. Ketubot 112a).

2בשנה ההיא IN THAT YEAR although it was not a normal year, being a year of famine.

3בארץ ההיה בשנה ההיא In that land and in that year. — Why is there mention of the two — that land and that year? To tell you that that soil was hard and that year was a hard one (Genesis Rabbah 64:6).

4מאה שערים AN HUNDREDFOLD — for they had estimated how much it should have yielded and it yielded one hundred for every measure which they had estimated. Our Rabbis said that the estimate was made for the purpose of the tithe (Genesis Rabbah 64:6).