Gen 24:67 And Isaac brought her into his mother Sarah’s tent, and took Rebekah, and she became his wife; and he loved her: and Isaac was comforted after his mother’s death.
Rashi on Gen 24:67 “to the tent of Sarah his mother: He brought her to the tent, and behold, she was Sarah his mother; i.e., she became the likeness of Sarah his mother, for as long as Sarah was alive, a candle burned from one Sabbath eve to the next, a blessing was found in the dough, and a cloud was attached to the tent. When she died, these things ceased, and when Rebecca arrived, they resumed (Gen. Rabbah 60:16).”