Genesis 28:1

And Isaac called Jacob, and blessed him, and charged [commanded] him, and said unto him, Thou shalt not take a wife of the daughters of Canaan.

Geneva Bible - Then Isaac called Jacob and (a) blessed him, and charged him, and said unto
him, Take not a wife of the daughters of Canaan.
(a) This second blessing was to confirm Jacob's faith, lest he should think that his father had given it
without God's motion.