Moses
Genesis 34:5ESV·traditional attribution

Now Jacob heard that he had defiled his daughter Dinah. But his sons were with his livestock in the field, so Jacob held his peace until they came.

John Calvin Reformed @genevareformer

5. And Jacob heard. Moses inserts a single verse concerning the silent sorrow of Jacob. We know that they who have not been accustomed to reproaches, are the more grievously affected when any dishonor happens to them. Therefore the more this prudent man had endeavored to keep his family pure from every stain, chaste and well-ordered, the more deeply is he wounded.

Matthew Henry Presbyterian @wholebiblehenry

Dinah was, for aught that appears, Jacob's only daughter, and we may suppose her therefore the mother's fondling and the darling of the family, and yet she proves neither a joy nor a credit to them; for those children seldom prove either the best or the happiest that are most indulged. She is reckoned now but fifteen or sixteen years of age when she here occasioned so much mischief.

Commenting on Genesis 34:1-5

John Gill Reformed Baptist @doctorgill

And Jacob heard that he had defiled Dinah his daughter,.... That is, that Shechem had defiled her; the report of this was brought him very probably by one of the maids which attended her to the city; for it was hardly to be thought that she should go thither alone, and which must be very distressing to Jacob to hear of: this was his first...