Rashi on Genesis 26:35/רש"י על בראשית כ״ו:ל״ה

1מרת רוח [AND THEY WERE] A VEXATION OF SPIRIT — the expression means opposing the spirit of a person. The first word is of the same root as (Deuteronomy 9:24), “Ye have been rebellious (ממרים)”: all their actions tended to be a grief

2ליצחק ולרבקה TO ISAAC AND REBEKAH, because they worshipped idols (Genesis Rabbah 65:4).