Genesis 34:7 (BSB)

When Jacob’s sons heard what had happened, they returned from the field. They were filled with grief and fury, because Shechem had committed an outrage in Israel by lying with Jacob’s daughter—a thing that should not be done.

From Genesis 34. Also in the ESV.

Commentary on Genesis 34:7

• John Calvin (Reformed), Calvin's Commentaries on Genesis 34:7: 7. And the sons of Jacob came out of the field. Moses begins to relate the tragic issue of this history. Shechem, indeed, had acted wickedly and impiously; but it was far more atrocious and wicked that the sons of Jacob should murder a whole people, to avenge themselves of the private fault of one man.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Genesis 34:6-17: Jacob's sons, when they heard of the injury done to Dinah, showed a very great resentment of it, influenced perhaps rather by jealousy for the honour of their family than by a sense of virtue. Many are concerned at the shamefulness of sin that never lay to heart the sinfulness of it.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Genesis 34:7: And the sons of Jacob came out of the field, when they heard it,..... Either by a messenger Jacob sent to them, to acquaint them with it, or by some other hand: however, be it as it will, as soon as they heard of the abuse of their sister, they immediately left their flocks to the care of their servants, and came to their father's...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Genesis 34:7: the men were grieved, and . . . very wroth--Good men in such a case could not but grieve; but it would have been well if their anger had been less, or that they had known the precept "let not the sun go down upon your wrath" [Eph 4:26].