This was contrary to divine appointment. Deuteronomy 7:3-4.
Genesis 34:4-9
4 And Shechem spake unto his father Hamor, saying, Get me this damsel to wife.
5 And Jacob heard that he had defiled Dinah his daughter: now his sons were with his cattle in the field: and Jacob held his peace until they were come.
6 And Hamor the father of Shechem went out unto Jacob to commune with him.
7 And the sons of Jacob came out of the field when they heard it: and the men were grieved, and they were very wroth, because he had wrought folly in Israel in lying with Jacob's daughter; which thing ought not to be done.
8 And Hamor communed with them, saying, The soul of my son Shechem longeth for your daughter: I pray you give her him to wife.
9 And make ye marriages with us, and give your daughters unto us, and take our daughters unto you.