Rashi on Genesis 24:8/רש"י על בראשית כ״ד:ח׳

1'ונקית משבעתי וגו THEN SHALT THOU BE CLEAR FROM THIS MY OATH etc. — and take a wife for him from the daughters of Aner or Eshcol or Mamre.

2רק את בני וגו ONLY [BRING NOT] MY SON [THITHER] etc. — The word רק narrows and limits (מעוט) the sense: it is only my son who may not go back there, but Jacob, my son’s son, in the end will go back there to find a wife (Genesis Rabbah 59:10).