13 Because their sister Dinah had been defiled, Jacob’s sons replied deceitfully as they spoke to Shechem and his father Hamor.

Read Genesis 34:13 Using Other Translations

And the sons of Jacob answered Shechem and Hamor his father deceitfully, and said, because he had defiled Dinah their sister:
The sons of Jacob answered Shechem and his father Hamor deceitfully, because he had defiled their sister Dinah.
But since Shechem had defiled their sister, Dinah, Jacob’s sons responded deceitfully to Shechem and his father, Hamor.