Genesis 26:35

And Isaac and Rebekah had grief of mind because of them.

Genesis 6:2

The sons of God saw that the daughters of men were fair; and they took wives for themselves from those who were pleasing to them.

Genesis 27:46-2

Then Rebekah said to Isaac, My life is a weariness to me because of the daughters of Heth: if Jacob takes a wife from among the daughters of Heth, such as these, the women of this land, of what use will my life be to me?

Genesis 28:8

It was clear to Esau that his father had no love for the women of Canaan,

Treasury of Scripture Knowledge

Summary

Which were a grief of mind unto Isaac and to Rebekah.

General references

Bible References

Which

Genesis 6:2
The sons of God saw that the daughters of men were fair; and they took wives for themselves from those who were pleasing to them.
Genesis 27:46
Then Rebekah said to Isaac, My life is a weariness to me because of the daughters of Heth: if Jacob takes a wife from among the daughters of Heth, such as these, the women of this land, of what use will my life be to me?
Genesis 28:1
Then Isaac sent for Jacob, and blessing him, said, Do not take a wife from among the women of Canaan;

General references

Genesis 34:9
And let our two peoples be joined together; give your daughters to us, and take our daughters for yourselves.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain