Rebecca

Genesis 24 tells the tale on how Rebecca became Isaac's wife.

After the death of Abraham's wife Sarah, Abraham sends his most trusted servant away to find a wife for his son Isaac.  The servant--who is never given a name--is given explicit instructions on how to find her.  He is to go back to Abraham's homeland, and among his relatives, there he will find one suitable for Isaac.  The servant came to a well, and prayed to the Lord that the girl who comes by a not only offer him a drink but will also be generous enough with her water to quench the thirst of his camels, would be the one the Lord has chosen.

Rebecca arrived . . . and she said everything that was supposed to be said.  She was also, indeed, one of the relatives Abraham spoke of.

The final piece of the puzzle was that Rebecca had to agree to go.  Her mother and brother wanted Rebecca to stay a week before leaving, but when asked, Rebecca said she would go immediately.

It's never said prior to this, but the death of Isaac's mother must've hurt him terribly, because when he saw Rebecca and they married, she comforted him and eased the pain of Sarah's death.